reaffirmation vs affirmation

reaffirmation and affirmation both are nouns.

Word	Noun	Adjective	Verb	Adverb
reaffirmation	Yes	No	No	No
affirmation	Yes	No	No	No

As nouns, affirmation is a hypernym of reaffirmation; that is, affirmation is a word with a broader meaning than reaffirmation:

Other hypernyms of reaffirmation include avouchment, avowal.

reaffirmation (noun)	affirmation (noun)
renewed affirmation	a judgment by a higher court that the judgment of a lower court was correct and should stand
	a statement asserting the existence or the truth of something
	(religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds)
	the act of affirming or asserting or stating something