spherical vs sphere

spherical is not a noun while sphere is a noun.

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

spherical (noun)	sphere (noun)
	any spherically shaped artifact
	a particular aspect of life or activity
	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

spherical (adjective)	sphere (adjective)
of or relating to spheres or resembling a sphere
having the shape of a sphere or ball