quill pen vs quill

quill pen and quill both are nouns.

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

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

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