pinion vs plumage

pinion and plumage both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinion	Yes	No	Yes	No
plumage	Yes	No	No	No

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

pinion: 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 pinion include plume.

pinion (noun)	plumage (noun)
wing of a bird	the light horny waterproof structure forming the external covering of birds
any of the larger wing or tail feathers of a bird
a gear with a small number of teeth designed to mesh with a larger wheel or rack

pinion (verb)	plumage (verb)
cut the wings off (of birds)
bind the arms of