colloquialism vs loony

colloquialism and loony both are nouns.

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

colloquialism (noun)	loony (noun)
a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech	someone deranged and possibly dangerous

colloquialism (adjective)	loony (adjective)
	informal or slang terms for mentally irregular