remand vs send back

remand is a noun but send back is not a noun.

Word	Noun	Adjective	Verb	Adverb
remand	Yes	No	Yes	No
send back	No	No	Yes	No

As verbs, remand and send back are synonyms defined as:

remand and send back: refer (a matter or legal case) to another committee or authority or court for decision

Other synonyms of remand include remit.

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

remand (verb)	send back (verb)
refer (a matter or legal case) to another committee or authority or court for decision	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