space capsule vs spacecraft

space capsule and spacecraft both are nouns.

Word	Noun	Adjective	Verb	Adverb
space capsule	Yes	No	No	No
spacecraft	Yes	No	No	No

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

space capsule: a spacecraft designed to transport people and support human life in outer space
spacecraft: a craft capable of traveling in outer space; technically, a satellite around the sun

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

space capsule (noun)	spacecraft (noun)
a spacecraft designed to transport people and support human life in outer space	a craft capable of traveling in outer space; technically, a satellite around the sun