screenwriter vs scriptwriter

screenwriter and scriptwriter both are nouns.

Word	Noun	Adjective	Verb	Adverb
screenwriter	Yes	No	No	No
scriptwriter	Yes	No	No	No

As nouns, scriptwriter is a hypernym of screenwriter; that is, scriptwriter is a word with a broader meaning than screenwriter:

screenwriter: someone who writes screenplays
scriptwriter: someone who writes scripts for plays or movies or broadcast dramas

screenwriter (noun)	scriptwriter (noun)
someone who writes screenplays	someone who writes scripts for plays or movies or broadcast dramas