pinion vs primary quill

pinion and primary quill both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinion	Yes	No	Yes	No
primary quill	Yes	No	No	No

As nouns, primary quill is a hyponym of pinion; that is, primary quill is a word with a more specific, narrower meaning than pinion:

pinion: any of the larger wing or tail feathers of a bird
primary quill: one of the main flight feathers projecting along the outer edge of a bird's wing

Other hyponyms of pinion include primary, primary feather, tail feather.

pinion (noun)	primary quill (noun)
wing of a bird	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
a gear with a small number of teeth designed to mesh with a larger wheel or rack

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