lunar module vs spacecraft

lunar module and spacecraft both are nouns.

Word	Noun	Adjective	Verb	Adverb
lunar module	Yes	No	No	No
spacecraft	Yes	No	No	No

As nouns, spacecraft is a hypernym of lunar module; that is, spacecraft 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
spacecraft: a craft capable of traveling in outer space; technically, a satellite around the sun

Other hypernyms of lunar module include ballistic capsule, space vehicle.

lunar module (noun)	spacecraft (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