pinion vs constrain

pinion is a noun but constrain is not a noun.

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

As verbs, constrain is a hypernym of pinion; that is, constrain is a word with a broader meaning than pinion:

pinion: bind the arms of
constrain: to close within bounds, or otherwise limit or deprive of free movement

Other hypernyms of pinion include confine, hold, restrain.

pinion (noun)	constrain (noun)
wing of a bird
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)	constrain (verb)
cut the wings off (of birds)	severely restrict in scope or extent
bind the arms of	to close within bounds, or otherwise limit or deprive of free movement
	compel to behave in a certain way