tragedian vs author

tragedian and author both are nouns.

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

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

tragedian: a writer (especially a playwright) who writes tragedies
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of tragedian include writer.

tragedian (noun)	author (noun)
an actor who specializes in tragic roles	writes (books or stories or articles or the like) professionally (for pay)
a writer (especially a playwright) who writes tragedies	someone who originates or causes or initiates something

tragedian (verb)	author (verb)
	be the author of