chummy vs colloquialism

chummy is not a noun while colloquialism is a noun.

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

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

chummy (adjective)	colloquialism (adjective)
(used informally) associated on close terms
(used colloquially) having the relationship of friends or pals