tardily vs colloquialism

tardily is not a noun while colloquialism is a noun.

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

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

tardily (adverb)	colloquialism (adverb)
without speed (`slow' is sometimes used informally for `slowly')
later than usual or than expected