authenticate vs attest

authenticate and attest both are verbs.

Word	Noun	Adjective	Verb	Adverb
authenticate	No	No	Yes	No
attest	No	No	Yes	No

As verbs, attest is a hypernym of authenticate; that is, attest is a word with a broader meaning than authenticate:

authenticate: establish the authenticity of something
attest: provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes

Other hypernyms of authenticate include certify, demonstrate, evidence, manifest.

authenticate (verb)	attest (verb)
establish the authenticity of something	authenticate, affirm to be true, genuine, or correct, as in an official capacity
	provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
	give testimony in a court of law
	establish or verify the usage of