pen vs nib

pen and nib both are nouns.

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

pen (noun)	nib (noun)
female swan	horny projecting mouth of a bird
a writing implement with a point from which ink flows	the writing point of a pen
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)	nib (verb)
produce a literary work