spaceship vs starship

spaceship and starship both are nouns.

Word	Noun	Adjective	Verb	Adverb
spaceship	Yes	No	No	No
starship	Yes	No	No	No

As nouns, spaceship and starship are synonyms defined as:

spaceship and starship: a spacecraft designed to carry a crew into interstellar space (especially in science fiction)

spaceship (noun)	starship (noun)
a spacecraft designed to carry a crew into interstellar space (especially in science fiction)	a spacecraft designed to carry a crew into interstellar space (especially in science fiction)