crapshoot vs colloquialism

crapshoot and colloquialism both are nouns.

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

crapshoot (noun)	colloquialism (noun)
playing craps	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
a risky and uncertain venture