sector vs sphere

sector and sphere both are nouns.

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

As nouns, sector and sphere are synonyms defined as:

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