upstart
noun
[ ˈʌpstɑːt ]
• a person who has risen suddenly in rank or importance, especially one who behaves arrogantly.
• "the upstarts who dare to challenge the legitimacy of his rule"
Similar:
parvenu(e),
arriviste,
nouveau riche,
vulgarian,
status seeker,
social climber,
the new rich,
new money,
would-be,
wannabe,
• a series of movements on the parallel or asymmetric bars, by which a gymnast swings to a position in which their body is supported by their arms above the bar, especially at the start of a routine.