put behind bars vs confine

put behind bars and confine both are verbs.

Word	Noun	Adjective	Verb	Adverb
put behind bars	No	No	Yes	No
confine	No	No	Yes	No

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

Other hypernyms of put behind bars include detain.

put behind bars (verb)	confine (verb)
lock up or confine, in or as in a jail	place limits on (extent or amount or access)
	to close within bounds, or otherwise limit or deprive of free movement
	prevent from leaving or from being removed
	deprive of freedom; take into confinement
	close in