primary quill vs quill

primary quill and quill both are nouns.

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

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

primary quill: one of the main flight feathers projecting along the outer edge of a bird's wing
quill: any of the larger wing or tail feathers of a bird

Other hypernyms of primary quill include flight feather, pinion, quill feather.

primary quill (noun)	quill (noun)
one of the main flight feathers projecting along the outer edge of a bird's wing	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