Similar word to titleholder:
advocate, ally, backer, challenger, champ, conqueror, defender, endorser, exponent, expounder, guardian, hero, heroine, medalist, nonpareil, number one, numero uno, paladin, partisan, patron, proponent, protector, supporter, sympathizer, the greatest, titleholder, top dog, upholder, vanquisher, victor, vindicator, warrior, winner
advocate, ally, backer, challenger, champ, conqueror, defender, endorser, exponent, expounder, guardian, hero, heroine, medalist, nonpareil, number one, numero uno, paladin, partisan, patron, proponent, protector, supporter, sympathizer, the greatest, titleholder, top dog, upholder, vanquisher, victor, vindicator, warrior, winner