Roberts vs author

Roberts and author both are nouns.

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

Roberts (noun)	author (noun)
a Welsh pirate credited with having taken more than 400 ships (1682-1722)	writes (books or stories or articles or the like) professionally (for pay)
United States writer remembered for his historical novels about colonial America (1885-1957)	someone who originates or causes or initiates something
United States evangelist (born 1918)
United States biochemist (born in England) honored for his discovery that some genes contain introns (born in 1943)

Roberts (verb)	author (verb)
	be the author of