primo vs colloquialism

primo and colloquialism both are nouns.

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

primo (noun)	colloquialism (noun)
the principal part of a duet (especially a piano duet)	a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech

primo (adjective)	colloquialism (adjective)
the best of its kind