Clemens vs author

Clemens and author both are nouns.

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

Clemens (noun)	author (noun)
United States writer and humorist best known for his novels about Tom Sawyer and Huckleberry Finn (1835-1910)	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

Clemens (verb)	author (verb)
	be the author of