palsy-walsy vs colloquialism

palsy-walsy is not a noun while colloquialism is a noun.

Word	Noun	Adjective	Verb	Adverb
palsy-walsy	No	Yes	No	No
colloquialism	Yes	No	No	No

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

palsy-walsy (adjective)	colloquialism (adjective)
(used colloquially) having the relationship of friends or pals