purview vs orbit

purview and orbit both are nouns.

Word	Noun	Adjective	Verb	Adverb
purview	Yes	No	No	No
orbit	Yes	No	Yes	No

As nouns, orbit is a hypernym of purview; that is, orbit is a word with a broader meaning than purview:

Other hypernyms of purview include ambit, compass, range, reach, scope.

purview (noun)	orbit (noun)
the range of interest or activity that can be anticipated	an area in which something acts or operates or has power or control:
	the bony cavity in the skull containing the eyeball
	the (usually elliptical) path described by one celestial body in its revolution about another
	the path of an electron around the nucleus of an atom
	a particular environment or walk of life

purview (verb)	orbit (verb)
	move in an orbit