visa vs endorsement

visa and endorsement both are nouns.

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

As nouns, endorsement is a hypernym of visa; that is, endorsement is a word with a broader meaning than visa:

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

Other hypernyms of visa include countenance, imprimatur, indorsement, sanction, warrant.

visa (noun)	endorsement (noun)
an endorsement made in a passport that allows the bearer to enter the country issuing it	the act of endorsing
	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

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