answer, argument, bucking, challenge, comeback, complete answer, confounding, confutation, contention, contradiction, contraposition, contraremonstrance, contravention, contraversion, controversion, counteraccusation, counteraction, counterblast, countercharge, counterclaim, counterreply, counterstatement, counterworking, crosscurrent, crossing, defense, demolition, demurrer, denial, discrediting, effective rejoinder, exception, head wind, impugnation, impugnment, negation, objection, opposing, opposition, opposure, oppugnation, overthrow, overthrowal, plea, pleading, pleadings, rebutment, rebutter, refusal, refutal, refutation, rejection, rejoinder, replication, reply, resistance, response, retaliation, retort, riposte, special demurrer, special pleading, squelch, standing against, statement of defense, subversion, surrebuttal, surrebutter, surrejoinder, traversal, undercurrent, undermining, upset, upsetting

For further exploring for "rebuttal" in Webster Dictionary Online