pen nib vs pen

pen nib and pen both are nouns.

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

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