remand vs put behind bars

remand is a noun but put behind bars is not a noun.

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

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

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

remand (noun)	put behind bars (noun)
the act of sending an accused person back into custody to await trial (or the continuation of the trial)

remand (verb)	put behind bars (verb)
refer (a matter or legal case) to another committee or authority or court for decision	lock up or confine, in or as in a jail
lock up or confine, in or as in a jail