affidavit vs testimony

affidavit and testimony both are nouns.

Word	Noun	Adjective	Verb	Adverb
affidavit	Yes	No	No	No
testimony	Yes	No	No	No

As nouns, testimony is a hypernym of affidavit; that is, testimony is a word with a broader meaning than affidavit:

affidavit: written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath
testimony: a solemn statement made under oath

Other hypernyms of affidavit include instrument, legal document, legal instrument, official document.

affidavit (noun)	testimony (noun)
written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath	a solemn statement made under oath
	an assertion offering firsthand authentication of a fact
	something that serves as evidence