Marquand vs author

Marquand and author both are nouns.

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

Marquand (noun)	author (noun)
United States writer who created the Japanese detective Mr. Moto and wrote other novels as well (1893-1960)	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

Marquand (verb)	author (verb)
	be the author of