no-brainer vs colloquialism

no-brainer and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
no-brainer	Yes	No	No	No
colloquialism	Yes	No	No	No

no-brainer (noun)	colloquialism (noun)
anything that requires little thought	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech