funny wagon vs colloquialism

funny wagon and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
funny wagon	Yes	No	No	No
colloquialism	Yes	No	No	No

funny wagon (noun)	colloquialism (noun)
an ambulance used to transport patients to a mental hospital	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech