What is another word for "competitor"?

Roget's Thesaurus (1911) lists these synonyms for "competitor": adversary, adverse, antagonist, applicant, aspirant, assailant, bagman, beggar, bete, bidder, brangler, brawler, bum, cadger, candidate, canvasser, case, child, claimant, client, core, demagogue, disputant, enemy, filibuster, flower, hard, hobo, homeless, hotel, hunter, knight, malcontent, mendicant, mumper, obstructionist, obstructive, opponent, opposition, oppositionist.