old vs colloquialism

old and colloquialism both are nouns.

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

old (noun)	colloquialism (noun)
past times	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech

old (adjective)	colloquialism (adjective)
of long duration; not new
(used especially of persons) having lived for a relatively long time or attained a specific age
skilled through long experience
(used for emphasis) very familiar
excellent
just preceding something else in time or order
belonging to some prior time