attestation vs testimony

attestation and testimony both are nouns.

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

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

attestation (noun)	testimony (noun)
the action of bearing witness	a solemn statement made under oath
the evidence by which something is attested	an assertion offering firsthand authentication of a fact
	something that serves as evidence