white-haired vs colloquialism

white-haired is not a noun while colloquialism is a noun.

Word	Noun	Adjective	Verb	Adverb
white-haired	No	Yes	No	No
colloquialism	Yes	No	No	No

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

white-haired (adjective)	colloquialism (adjective)
favorite
showing characteristics of age, especially having grey or white hair