environs vs ambience

environs and ambience both are nouns.

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

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

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

environs (noun)	ambience (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