endorsement vs visa

endorsement and visa both are nouns.

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

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

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

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

endorsement (noun)	visa (noun)
the act of endorsing	an endorsement made in a passport that allows the bearer to enter the country issuing it
formal and explicit approval
a promotional statement (as found on the dust jackets of books)
a speech seconding a motion
a signature that validates something

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