put behind bars vs put away

put behind bars and put away both are verbs.

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

As verbs, put behind bars and put away are synonyms defined as:

Other synonyms of put behind bars include gaol, immure, imprison, incarcerate, jail, jug, lag, remand.

put behind bars (verb)	put away (verb)
lock up or confine, in or as in a jail	turn away from and put aside, perhaps temporarily
	eat up; usually refers to a considerable quantity of food
	kill gently, as with an injection
	place in a place where something cannot be removed or someone cannot escape
	stop using
	throw or cast away
	lock up or confine, in or as in a jail