litterateur vs author

litterateur and author both are nouns.

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

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

litterateur: a writer of literary works
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of litterateur include writer.

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

litterateur (verb)	author (verb)
	be the author of