constrain vs pinion

constrain is not a noun while pinion is a noun.

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

As verbs, pinion is a hyponym of constrain; that is, pinion is a word with a more specific, narrower meaning than constrain:

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

Other hyponyms of constrain include bind, tie down, tie up, truss, fetter, shackle, enchain, shackle, impound, pound, pound, pound up, fold, pen up, ground.

constrain (noun)	pinion (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

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