There are various lexical differences between Quebec French and Metropolitan French in France. These are distributed throughout the registers, from slang to formal usage.

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Notwithstanding Acadian French in the Maritime Provinces, Quebec French is the dominant form of French throughout Canada, with only very limited interregional variations. The terms Quebec French and Canadian French are therefore often used interchangeably.

The Office québécois de la langue française believes that neither morphology nor syntax should be different between Québécois and Metropolitan French, and even that phonetic differences should be kept to a minimum. However, starting in the 1960s, it agreed to the use of words then called "well-formed Canadianisms (canadianismes de bon aloi)," that either are regional in nature (such as names of plants and animals), have been used since before the Conquest, or are justified in their origin and are considered to be equivalent or "better" than the standard equivalent.

A very small list of words was published in 1969, mainly containing words that were archaic in France, but still common in Quebec. This list especially contained imperial units and words from aboriginal languages. Subsequent lists have been published regularly since then.

Many differences that exist between Quebec French and European French arise from the preservation of certain forms that are today archaic in Europe. New words were also created for Quebec specialties that do not exist in Europe.

As with any two regional variants, there is an abundance of slang terms found in Quebec that are not found in France. Quebec French profanity uses references to Catholic liturgical terminology, rather than the references to prostitution that are more common in France. Many English words and calques have also been integrated in Quebec French, although less than in France. In Quebec, borrowed English words tend to have the same meaning as the English word. In France, they often have a very different meaning; for example 'le smoking' for 'tuxedo'. Borrowing from English is politically sensitive in Quebec and tends to be socially discouraged.^{[citation needed]}

Many differences that exist between Quebec French and Metropolitan French arise from the preservation of certain forms that are today archaic in Europe. For example, espérer for "to wait" (attendre in France).

Cour in Quebec is a backyard (jardin in French), whereas in France cour has dropped this meaning and primarily means a courtyard (as well as other meanings like court). However, in some areas of France, such as in the mining regions of northern France, cour still means backyard.

The word breuvage is used for "[a] drink" in addition to boisson; this is an old French usage (bevrage) from which the English "beverage" originates. Breuvage may be used in European French, but generally indicates some nuance, possibly pejorative.

The word piastre or piasse, a slang term for a dollar (equivalent to "buck" in English), was in fact the term originally used in French for the American or Spanish dollar (they had the same value for a long period).

The word couple is used in standard French as a masculine noun (a couple, married or unmarried), but in Quebec it is also used as a feminine noun in phrases like une couple de semaines (a couple of weeks). This is often thought to be an anglicism, but is in fact a preservation of an archaic French usage.

It is quite common in Quebec French to describe something positive using litotes, such as pas laid (not ugly) for beautiful or pas pire (not worst) for good when standard French would suggest using the positive equivalent instead. However, Metropolitan French has its own commonly used litotes: pas bête or pas con (smart); pas mal (fine); pas dégueu(lasse) (tasty); and pas top, pas super or pas génial (bad).

A number of terms that in other French-speaking regions are exclusively nautical are used in wider contexts in Quebec. This is often attributed to the original arrival of French immigrants by ship, and to the dominance of the Saint Lawrence River as the principal means of transport among the major settlements of the region in the past centuries. An example is the word débarquer, which in Quebec means to get off any conveyance (a car, a train); in France, this word means only to disembark from a ship or aircraft (descendre from other vehicles), plus some colloquial uses. Another example would be vadrouille for mop (in French it would mean wandering or a mop made of ropes and used on a ship, the regular house mop would be called serpillère).

Since Canada uses the Westminster system, unlike republican France, many political terms devised in English have had to be imported or new terms created. This is not always easy, and can lead to awkward constructions, the most famous example being Dominion, for which there is no French translation. As well in Canadian English the first minister of the federation is called the Prime Minister and the first minister of a province is called a Premier. An electoral district in Canada is called a "riding" in anglophone Canada but a "comté" in Québec. However French makes no distinction and both are called Premier ministre in all cases. For example, "Premier ministre du Canada", "Premier ministre du Québec / de l'Alberta", etc.

There are also words for Quebec specialties that do not exist in Europe, for example poutine, CEGEP, tuque (a Canadianism in both official languages), and dépanneur (a corner store/small grocery; dépanneur in France is a mechanic who comes in to repair a car or a household appliance, which is called a dépanneuse in Quebec).

Blueberries, abundant in the Saguenay-Lac-Saint-Jean, are called bleuets; in France, they are lumped together with myrtilles (bilberries) and bleuet means cornflower. (Bleuet is also slang for someone from Saguenay-Lac-Saint-Jean.) Although very similar, these are not the same plants (i.e. myrtilles are Vaccinium myrtillus and bleuets are Vaccinium angustifolium or corymbosum).

This section does not cite any sources. (April 2023)

French speakers of Quebec use the informal second-person pronoun tu more often and in more contexts than speakers in France do. In certain contexts it may be perfectly appropriate to address a stranger or even the customer of a store using tu, whereas the latter would be considered impolite in France. The split often runs across generations in Quebec: People between 40 and 60 years of age often feel that sales people, or service personnel giving them a tu instead of a vous are uncouth or uncultivated. People 60 years of age and older will sometimes feel insulted if a stranger uses the tu to them. Government employees (such as policemen or bureaucrats with some contact with the public) as well as employees of large stores or large chains in Quebec are usually instructed to use vous with everybody, unless some kind of camaraderie is in play or they know the person well. Sometimes the split is also across social or educational lines. For instance, young academics are usually hesitant in using tu with slightly older colleagues who have just a few more years of seniority.

A similar distinction in English, where, since the second person singular thou went out of use 200 years ago, might be whether to address or respond to someone on a "first-name basis". For example, one might say to a man that one has just met, "Thank you, Mr. Gibson" — equivalent to using vous. If Mr Gibson wants to maintain formality, that is, similar to using vous, he might say, "You're welcome", and if he wants to be more relaxed and familiar, he would add, "Please call me Jim". This gives Anglophones an inkling of the use of tu in Canadian French.

Metropolitan French public speakers such as politicians occasionally come across as stuffy or snobbish to certain Quebec Francophones. There is also a certain impression among the Quebec population (men especially) that Metropolitan French is quite effeminate - though this is not often directly discussed. This may explain why even better educated Québécois rarely try to emulate the Metropolitan French accent, though many probably could do so with relative ease. This is also true for people from southern France. Visitors from southern France who move temporarily to Paris and pick up the local Parisian accent may be derided by their friends who have remained in the south. This is all similar to the perception North American English-speakers may have of British English as "uppity" or "fancy".

There is a huge variety of idioms in Quebec that do not exist in France, such as fait que ("so"); en masse ("a lot"); s'en venir (for arriver and venir ici); ben là! or voyons donc! ("oh, come on!"), de même (for comme ça).

Entire reference books have been written about idioms specific to Quebec. A handful of examples among many hundreds:

• J'ai mon voyage = J'en ai marre / Pas possible! = I'm fed up / Unbelievable!
• C'est de valeur = C'est dommage = What a pity
• Habillé comme la chienne à Jacques = Dressed up like a dog's dinner
• C’est malade/fou raide = That's sick/crazy/rad
• Se faire avoir = to get fooled
• Mais que = lorsque, quand que = When... (the subjunctive must follow this form)
• Tirer le diable par la queue = Avoir les difficultés avec l’argent = I'm in a tight spot financially
• Se faire passer un sapin = To be lied to
• Avoir une face à claque = a bad person
• Avoir les yeux dans la graisse de bines = to be in love or to be tired (glassy-eyed)
• Avoir l’estomac dans les talons = to be extremely hungry
• Être né pour un petit pain = One who doesn't have many opportunities. Usually used in the negative form.
• Il fait frette = It is cold
• Chanter la pomme = to flirt
• Se pogner le cul = to sit and do nothing all day
• Je m'en sacre = I do not give a damn

Dialogue in sitcoms on Quebec television often uses such idioms extensively, which can make certain dialogues rather incomprehensible to French speakers of Europe. Most speakers will use various contractions, omitting certain articles or even changing the pronunciation of certain words, which can be daunting for inexperienced speakers.

As with any two regional variants, there is an abundance of slang terms found in Quebec that are not found in France. Quebec French profanity uses references to Catholic liturgical equipment, rather than the references to prostitution that are more common in France.

The expression "you're welcome" is bienvenue or ça me fait plaisir in Quebec, though de rien or y'a pas de quoi is also used in Quebec. Note that the expression bonne journée (as opposed to bonjour) is also often used for "goodbye" in Quebec (similar to "Good Day"), which it is not in France (where it is more common to say au revoir or bye).

Some slang terms unique to Quebec:

Loanwords from English, as well as calques or loans of syntactic structures, are known as anglicisms (French: anglicismes).

Like most global languages there are regional differences. Even within Quebec there are regional uses of words or expression. Here are some other differences between standard Quebec French and France French:

Many, but not all, of the European equivalents for the words listed above are also used or at least understood in Quebec.

• Official Quebec dictionary (Grand dictionnaire terminologique multilingue by the Office québécois de la langue française)
• Quebec French profanity