orbit vs expanse

orbit and expanse both are nouns.

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

As nouns, expanse is a hyponym of orbit; that is, expanse is a word with a more specific, narrower meaning than orbit:

orbit (noun)	expanse (noun)
an area in which something acts or operates or has power or control:	the extent of a 2-dimensional surface enclosed within a boundary
the bony cavity in the skull containing the eyeball	a wide scope
the (usually elliptical) path described by one celestial body in its revolution about another	a wide and open space or area as of surface or land or sky
the path of an electron around the nucleus of an atom
a particular environment or walk of life

orbit (verb)	expanse (verb)
move in an orbit