visitor vs boulevardier

visitor and boulevardier both are nouns.

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

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

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

visitor (noun)	boulevardier (noun)
someone who visits	a visitor of a city boulevard (especially in Paris)