quill vs pen

quill and pen both are nouns.

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

As nouns, pen is a hypernym of quill; that is, pen is a word with a broader meaning than quill:

quill (noun)	pen (noun)
a stiff hollow protective spine on a porcupine or hedgehog	female swan
the hollow spine of a feather	a writing implement with a point from which ink flows
any of the larger wing or tail feathers of a bird	an enclosure for confining livestock
pen made from a bird's feather	a correctional institution for those convicted of major crimes
	a portable enclosure in which babies may be left to play

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