alula vs plumage

alula and plumage both are nouns.

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

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

alula: tuft of small stiff feathers on the first digit of a bird's wing
plumage: the light horny waterproof structure forming the external covering of birds

Other hypernyms of alula include plume.

alula (noun)	plumage (noun)
tuft of small stiff feathers on the first digit of a bird's wing	the light horny waterproof structure forming the external covering of birds
scalelike structure between the base of the wing and the halter of a two-winged fly