aftershaft vs plumage

aftershaft and plumage both are nouns.

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

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

aftershaft: a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds
plumage: the light horny waterproof structure forming the external covering of birds

Other hypernyms of aftershaft include plume.

aftershaft (noun)	plumage (noun)
a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds	the light horny waterproof structure forming the external covering of birds