orbital motion vs orbital rotation

orbital motion and orbital rotation both are nouns.

Word	Noun	Adjective	Verb	Adverb
orbital motion	Yes	No	No	No
orbital rotation	Yes	No	No	No

As nouns, orbital motion and orbital rotation are synonyms defined as:

orbital motion and orbital rotation: motion of an object in an orbit around a fixed point

orbital motion (noun)	orbital rotation (noun)
motion of an object in an orbit around a fixed point	motion of an object in an orbit around a fixed point