colloquialism vs gumshoe

colloquialism and gumshoe both are nouns.

Word	Noun	Adjective	Verb	Adverb
colloquialism	Yes	No	No	No
gumshoe	Yes	No	No	No

colloquialism (noun)	gumshoe (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech	a waterproof overshoe that protects shoes from water or snow
	someone who is a detective