colloquialism vs crummy

colloquialism is a noun but crummy is not a noun.

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

colloquialism (noun)	crummy (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech

colloquialism (adjective)	crummy (adjective)
	of very poor quality; flimsy