ambiance vs environment

ambiance and environment both are nouns.

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

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

Other hypernyms of ambiance include environs, surround, surroundings.

ambiance (noun)	environment (noun)
the atmosphere of an environment	the area in which something exists or lives
a particular environment or surrounding influence	the totality of surrounding conditions