pen vs pen nib

pen and pen nib both are nouns.

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

pen (noun)	pen nib (noun)
female swan	the writing point of a pen
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)	pen nib (verb)
produce a literary work