quill feather vs plumage

quill feather and plumage both are nouns.

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

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

quill feather: any of the larger wing or tail feathers of a bird
plumage: the light horny waterproof structure forming the external covering of birds

Other hypernyms of quill feather include plume.

quill feather (noun)	plumage (noun)
any of the larger wing or tail feathers of a bird	the light horny waterproof structure forming the external covering of birds