affirm vs shew

affirm and shew both are verbs.

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

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

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

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

affirm (verb)	shew (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
say yes to