Michael Ondaatje vs author

Michael Ondaatje and author both are nouns.

Word	Noun	Adjective	Verb	Adverb
Michael Ondaatje	Yes	No	No	No
author	Yes	No	Yes	No

Michael Ondaatje (noun)	author (noun)
Canadian writer (born in Sri Lanka in 1943)	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

Michael Ondaatje (verb)	author (verb)
	be the author of