umteenth vs colloquialism

umteenth is not a noun while colloquialism is a noun.

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

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

umteenth (adjective)	colloquialism (adjective)
last in an indefinitely numerous series