Johnny Reb vs colloquialism

Johnny Reb and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
Johnny Reb	Yes	No	No	No
colloquialism	Yes	No	No	No

Johnny Reb (noun)	colloquialism (noun)
`Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech