colloquialism vs plummy

colloquialism is a noun but plummy is not a noun.

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

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

colloquialism (adjective)	plummy (adjective)
	(of a voice) affectedly mellow and rich
	very desirable