visitor vs invitee

visitor and invitee both are nouns.

Word	Noun	Adjective	Verb	Adverb
visitor	Yes	No	No	No
invitee	Yes	No	No	No

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

Other hyponyms of visitor include boulevardier, caller, company, guest, visiting fireman.

visitor (noun)	invitee (noun)
someone who visits	a visitor to whom hospitality is extended