pen vs penning

pen and penning both are nouns.

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

pen (noun)	penning (noun)
female swan	the act of creating written works
a writing implement with a point from which ink flows
an enclosure for confining livestock
a correctional institution for those convicted of major crimes
a portable enclosure in which babies may be left to play

pen (verb)	penning (verb)
produce a literary work