home ground vs environs

home ground and environs both are nouns.

Word	Noun	Adjective	Verb	Adverb
home ground	Yes	No	No	No
environs	Yes	No	No	No

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

home ground: the type of environment in which an organism or group normally lives or occurs
environs: the area in which something exists or lives

Other hypernyms of home ground include environment, surround, surroundings.

home ground (noun)	environs (noun)
the type of environment in which an organism or group normally lives or occurs	the area in which something exists or lives
	an outer adjacent area of any place