environs vs ambiance

environs and ambiance both are nouns.

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

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

Other hyponyms of environs include ambience, medium, scene, setting, element, habitat, home ground, melting pot, parts.

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