lunar module vs space vehicle

lunar module and space vehicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
lunar module	Yes	No	No	No
space vehicle	Yes	No	No	No

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

lunar module: a spacecraft that carries astronauts from the command module to the surface of the moon and back
space vehicle: a craft capable of traveling in outer space; technically, a satellite around the sun

Other hypernyms of lunar module include ballistic capsule, spacecraft.

lunar module (noun)	space vehicle (noun)
a spacecraft that carries astronauts from the command module to the surface of the moon and back	a craft capable of traveling in outer space; technically, a satellite around the sun