affirm vs establish

affirm and establish both are verbs.

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

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

affirm: establish or strengthen as with new evidence or facts
establish: establish the validity of something, as by an example, explanation or experiment

Other hyponyms of affirm include back, back up, vouch, verify, demonstrate, prove, shew, show, document, validate.

affirm (verb)	establish (verb)
establish or strengthen as with new evidence or facts	establish the validity of something, as by an example, explanation or experiment
to declare or affirm solemnly and formally as true	institute, enact, or establish
say yes to	use as a basis for; found on
	place
	set up or lay the groundwork for
	bring about
	build or establish something abstract
	set up or found