colloquialism vs crapshoot

colloquialism and crapshoot both are nouns.

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

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