primary quill vs flight feather

primary quill and flight feather both are nouns.

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

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

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

primary quill (noun)	flight 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