loony vs colloquialism

loony and colloquialism both are nouns.

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

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

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