send back vs remand

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

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

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

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

Other synonyms of send back include remit.

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

send back (verb)	remand (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