ambiance vs environs

ambiance and environs both are nouns.

Word	Noun	Adjective	Verb	Adverb
ambiance	Yes	No	No	No
environs	Yes	No	No	No

As nouns, environs is a hypernym of ambiance; that is, environs is a word with a broader meaning than ambiance:

Other hypernyms of ambiance include environment, surround, surroundings.

ambiance (noun)	environs (noun)
the atmosphere of an environment	the area in which something exists or lives
a particular environment or surrounding influence	an outer adjacent area of any place