avouch vs acknowledge

avouch and acknowledge both are verbs.

Word	Noun	Adjective	Verb	Adverb
avouch	No	No	Yes	No
acknowledge	No	No	Yes	No

As verbs, acknowledge is a hypernym of avouch; that is, acknowledge is a word with a broader meaning than avouch:

avouch: admit openly and bluntly; make no bones about
acknowledge: declare to be true or admit the existence or reality or truth of

Other hypernyms of avouch include admit.

avouch (verb)	acknowledge (verb)
admit openly and bluntly; make no bones about	accept as legally binding and valid
	accept (someone) to be what is claimed or accept his power and authority
	declare to be true or admit the existence or reality or truth of
	express obligation, thanks, or gratitude for
	report the receipt of
	express recognition of the presence or existence of, or acquaintance with