space vehicle vs orbiter

space vehicle and orbiter both are nouns.

Word	Noun	Adjective	Verb	Adverb
space vehicle	Yes	No	No	No
orbiter	Yes	No	No	No

As nouns, orbiter is a hypernym of space vehicle; that is, orbiter is a word with a broader meaning than space vehicle:

space vehicle: a craft capable of traveling in outer space; technically, a satellite around the sun
orbiter: man-made equipment that orbits around the earth or the moon

Other hypernyms of space vehicle include craft, artificial satellite, satellite.

space vehicle (noun)	orbiter (noun)
a craft capable of traveling in outer space; technically, a satellite around the sun	man-made equipment that orbits around the earth or the moon