stiffen vs confine

stiffen and confine both are verbs.

Word	Noun	Adjective	Verb	Adverb
stiffen	No	No	Yes	No
confine	No	No	Yes	No

As verbs, confine is a hypernym of stiffen; that is, confine is a word with a broader meaning than stiffen:

Other hypernyms of stiffen include bound, limit, restrict, throttle, trammel.

stiffen (verb)	confine (verb)
become stiff or stiffer	place limits on (extent or amount or access)
make stiff or stiffer	to close within bounds, or otherwise limit or deprive of free movement
severely restrict in scope or extent	prevent from leaving or from being removed
	deprive of freedom; take into confinement
	close in