sleuth
noun
[ sluːθ ]
• a person who investigates crimes; a detective.
• "they make MI5 look like a bunch of amateur sleuths"
Similar:
private detective,
detective,
private investigator,
investigator,
enquiry agent,
private eye,
PI,
snoop,
sleuth-hound,
private dick,
dick,
peeper,
shamus,
gumshoe,
hawkshaw,
sherlock,
Pinkerton,
sleuth
verb
• carry out a careful investigation into a crime or mystery.
• "there's nothing you can do but sleuth around until you find the answer"
Origin:
Middle English (originally in the sense ‘track’, in sleuth-hound): from Old Norse slóth ; compare with slot2. Current senses date from the late 19th century.