author vs penning

author and penning both are nouns.

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

author (noun)	penning (noun)
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

author (verb)	penning (verb)
be the author of