confirm vs document

confirm is not a noun while document is a noun.

Word	Noun	Adjective	Verb	Adverb
confirm	No	No	Yes	No
document	Yes	No	Yes	No

As verbs, document is a hyponym of confirm; that is, document is a word with a more specific, narrower meaning than confirm:

Other hyponyms of confirm include back, back up, vouch, verify, demonstrate, establish, prove, shew, show, validate.

confirm (noun)	document (noun)
	anything serving as a representation of a person's thinking by means of symbolic marks
	writing that provides information (especially information of an official nature)
	(computer science) a computer file that contains text (and possibly formatting instructions) using seven-bit ASCII characters
	a written account of ownership or obligation

confirm (verb)	document (verb)
make more firm	support or supply with references
establish or strengthen as with new evidence or facts	record in detail
strengthen or make more firm
administer the rite of confirmation to
support a person for a position