colloquialism vs tardily

colloquialism is a noun but tardily is not a noun.

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

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

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