sphere vs environment

sphere and environment both are nouns.

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

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

sphere (noun)	environment (noun)
any spherically shaped artifact	the area in which something exists or lives
a particular aspect of life or activity	the totality of surrounding conditions
the geographical area in which one nation is very influential
the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
a solid figure bounded by a spherical surface (including the space it encloses)
a three-dimensional closed surface such that every point on the surface is equidistant from the center
a particular environment or walk of life