Fitzgerald vs author

Fitzgerald and author both are nouns.

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

Fitzgerald (noun)	author (noun)
United States scat singer (1917-1996)	writes (books or stories or articles or the like) professionally (for pay)
United States author whose novels characterized the Jazz Age in the United States (1896-1940)	someone who originates or causes or initiates something
English poet remembered primarily for his free translation of the poetry of Omar Khayyam (1809-1883)

Fitzgerald (verb)	author (verb)
	be the author of