Synonyms of challenger

2 Syllables
scrappers, bidder, champions, rivals, bidders, defier
3 Syllables
opponent, resisters, darer, disputer, corival, resister, contender, superjock, contesters, athlete, disputant, opposer, contenders, contester, contestant, corrival, litigant
4 Syllables
competitor, counteragent, emulators, competitors, emulator
5 Syllables
oppositionist