quill vs quill pen

quill and quill pen both are nouns.

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

As nouns, quill and quill pen are synonyms defined as:

quill (noun)	quill pen (noun)
a stiff hollow protective spine on a porcupine or hedgehog	pen made from a bird's feather
the hollow spine of a feather
any of the larger wing or tail feathers of a bird
pen made from a bird's feather