space writer vs author

space writer and author both are nouns.

Word	Noun	Adjective	Verb	Adverb
space writer	Yes	No	No	No
author	Yes	No	Yes	No

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

space writer: a writer paid by the area of the copy
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of space writer include writer.

space writer (noun)	author (noun)
a writer paid by the area of the copy	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

space writer (verb)	author (verb)
	be the author of