Sinclair vs author

Sinclair and author both are nouns.

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

Sinclair (noun)	author (noun)
English electrical engineer who founded a company that introduced many innovative products (born in 1940)	writes (books or stories or articles or the like) professionally (for pay)
United States writer whose novels argued for social reform (1878-1968)	someone who originates or causes or initiates something

Sinclair (verb)	author (verb)
	be the author of