dead ringer vs colloquialism

dead ringer and colloquialism both are nouns.

Word	Noun	Adjective	Verb	Adverb
dead ringer	Yes	No	No	No
colloquialism	Yes	No	No	No

dead ringer (noun)	colloquialism (noun)
a person who is almost identical to another	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech