rathole vs colloquialism

rathole and colloquialism both are nouns.

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

rathole (noun)	colloquialism (noun)
a small dirty uncomfortable room	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
a hole (as in the wall of a building) made by rats