shooting gallery vs colloquialism

shooting gallery and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
shooting gallery	Yes	No	No	No
colloquialism	Yes	No	No	No

shooting gallery (noun)	colloquialism (noun)
an enclosed firing range with targets for rifle or handgun practice	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
a building (usually abandoned) where drug addicts buy and use heroin