assert vs affirm

assert and affirm both are verbs.

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

As verbs, assert and affirm are synonyms defined as:

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

assert (verb)	affirm (verb)
postulate positively and assertively	establish or strengthen as with new evidence or facts
to declare or affirm solemnly and formally as true	to declare or affirm solemnly and formally as true
state categorically	say yes to
insist on having one's opinions and rights recognized