dramatist vs author

dramatist and author both are nouns.

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

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

dramatist: someone who writes plays
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of dramatist include writer.

dramatist (noun)	author (noun)
someone who writes plays	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

dramatist (verb)	author (verb)
	be the author of