put behind bars vs immure

put behind bars and immure both are verbs.

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

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

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

put behind bars (verb)	immure (verb)
lock up or confine, in or as in a jail	lock up or confine, in or as in a jail