borscht belt vs colloquialism

borscht belt and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
borscht belt	Yes	No	No	No
colloquialism	Yes	No	No	No

borscht belt (noun)	colloquialism (noun)
(informal) a resort area in the Catskill Mountains of New York that was patronized primarily by Jewish guests	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech