colloquialism vs rathole

colloquialism and rathole both are nouns.

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

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