document vs affirm

document is a noun but affirm is not a noun.

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

As verbs, affirm is a hypernym of document; that is, affirm is a word with a broader meaning than document:

Other hypernyms of document include confirm, corroborate, substantiate, support, sustain.

document (noun)	affirm (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

document (verb)	affirm (verb)
support or supply with references	establish or strengthen as with new evidence or facts
record in detail	to declare or affirm solemnly and formally as true
	say yes to