affirm vs swear

affirm and swear both are verbs.

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

As verbs, affirm and swear are synonyms defined as:

Other synonyms of affirm include assert, aver, avow, swan, verify.

affirm (verb)	swear (verb)
establish or strengthen as with new evidence or facts	have faith or confidence in
to declare or affirm solemnly and formally as true	make a deposition; declare under oath
say yes to	utter obscenities or profanities
	promise solemnly; take an oath
	to declare or affirm solemnly and formally as true