commentator vs author

commentator and author both are nouns.

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

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

commentator: a writer who reports and analyzes events of the day
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of commentator include writer.

commentator (noun)	author (noun)
a writer who reports and analyzes events of the day	writes (books or stories or articles or the like) professionally (for pay)
an expert who observes and comments on something	someone who originates or causes or initiates something

commentator (verb)	author (verb)
	be the author of