primary quill vs quill feather

primary quill and quill feather both are nouns.

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

As nouns, quill feather is a hypernym of primary quill; that is, quill feather 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 feather: any of the larger wing or tail feathers of a bird

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

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