writing vs author

writing and author both are nouns.

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

writing (noun)	author (noun)
the activity of putting something in written form	writes (books or stories or articles or the like) professionally (for pay)
the act of creating written works	someone who originates or causes or initiates something
the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)
letters or symbols that are written or imprinted on a surface to represent the sounds or words of a language
(usually plural) the collected work of an author

writing (verb)	author (verb)
	be the author of