scenarist vs author

scenarist and author both are nouns.

Word	Noun	Adjective	Verb	Adverb
scenarist	Yes	No	No	No
author	Yes	No	Yes	No

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

scenarist: a writer of screenplays
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of scenarist include writer.

scenarist (noun)	author (noun)
a writer of screenplays	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

scenarist (verb)	author (verb)
	be the author of