[1] : WordNet (r) 2.0

come back
     v 1: come back to place where one has been before, or return to a
          previous activity syn: return, go back, get back
     2: be restored; "her old vigor returned" syn: return
     3: go back to something earlier; "this harks back to a previous
        remark of his" syn: hark back, return, recall
     4: even the score, in sports
     5: answer back syn: retort, repay, return, riposte, rejoin
see also:
return go back get back hark back recall retort 
repay riposte rejoin 

[2] : Moby Thesaurus II by Grady Ward, 1.0

48 moby thesaurus words for "come back":
   acknowledge, answer, answer back, bounce back, come around,
   come back at, come home, come round, come to, come up smiling,
   double, double back, echo, flash back, get about, get over,
   get well, give acknowledgment, give answer, go back, go home,
   make a comeback, pull round, pull through, put back, rally, react,
   recover, recur, reecho, rejoin, reply, respond, retort, return,
   return answer, return for answer, return to mind, reverberate,
   revive, riposte, say, say in reply, shoot back, survive, talk back,
   turn back, weather the storm

Back >> B Words
Back, definition of term: Back
back_pag1.html

Back Off >> B Words
Back Off, definition of term: Back Off
back+off_pag1.html

Back Out >> B Words
Back Out, definition of term: Back Out
back+out_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

Back Link >> B Words
Back Link, definition of term: Back Link
back+link_pag1.html

Back Down >> B Words
Back Down, definition of term: Back Down
back+down_pag1.html

Back Door >> B Words
Back Door, definition of term: Back Door
back+door_pag1.html

Back End >> B Words
Back End, definition of term: Back End
back+end_pag1.html

Back Country >> B Words
Back Country, definition of term: Back Country
back+country_pag1.html

Answer Back >> A Words
Answer Back, definition of term: Answer Back
answer+back_pag1.html