sphere vs sector

sphere and sector both are nouns.

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

As nouns, sphere and sector are synonyms defined as:

sphere (noun)	sector (noun)
any spherically shaped artifact	measuring instrument consisting of two graduated arms hinged at one end
a particular aspect of life or activity	a particular aspect of life or activity
the geographical area in which one nation is very influential	a social group that forms part of the society or the economy
the apparent surface of the imaginary sphere on which celestial bodies appear to be projected	a portion of a military position
a solid figure bounded by a spherical surface (including the space it encloses)	the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes
a three-dimensional closed surface such that every point on the surface is equidistant from the center	a plane figure bounded by two radii and the included arc of a circle
a particular environment or walk of life