okay vs visa

okay and visa both are nouns.

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

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

Other hyponyms of okay include sanctify, sanction, back, endorse, indorse, plump for, plunk for, support, confirm, greenlight.

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

okay (adjective)	visa (adjective)
being satisfactory or in satisfactory condition

okay (verb)	visa (verb)
give sanction to	provide (a passport) with a visa
	approve officially

okay (adverb)	visa (adverb)
in a satisfactory or adequate manner