imprimatur vs visa

imprimatur and visa both are nouns.

Word	Noun	Adjective	Verb	Adverb
imprimatur	Yes	No	No	No
visa	Yes	No	Yes	No

As nouns, visa is a hyponym of imprimatur; that is, visa is a word with a more specific, narrower meaning than imprimatur:

imprimatur: formal and explicit approval
visa: an endorsement made in a passport that allows the bearer to enter the country issuing it

Other hyponyms of imprimatur include O.K., OK, okay, okeh, okey, nihil obstat.

imprimatur (noun)	visa (noun)
formal and explicit approval	an endorsement made in a passport that allows the bearer to enter the country issuing it

imprimatur (verb)	visa (verb)
	provide (a passport) with a visa
	approve officially