rival
I
noun
adversary, aemulus, antagonist, aspirant, bidder, candidate, challenger, combatant, competition, competitor, contender, contestant, corrival, disputant, enemy, entrant, foe, litigant, opponent, opposition
II
index
adversary, antagonize, compete, competitive (antagonistic), conflict, confront (oppose), contend (dispute), contender, contestant, counteract, disputant, foe, jealous, outbalance, peer, resist (oppose), surpass, transcend
Burton's Legal Thesaurus.
William C. Burton.
2006