affirm vs tell

affirm and tell both are verbs.

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

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

Other hyponyms of affirm include hold, claim, take, attest, declare, protest, assure.

affirm (verb)	tell (verb)
establish or strengthen as with new evidence or facts	discern or comprehend
to declare or affirm solemnly and formally as true	mark as different
say yes to	let something be known
	narrate or give a detailed account of
	give instructions to or direct somebody to do something with authority
	give evidence
	express in words
	inform positively and with certainty and confidence