1) Adversary 2) Challenger 3) Competition 4) Contender 5) Contestant 6) Enemy 7) French word used in English 8) Opponent 9) Participator 10) Rival 1) Applicant 2) Candidate 3) Challenger 4) Champ 5) Combatant 6) Comer 7) Contender 8) Contestant 9) Entrant 10) Fighter 11) Finalist 12) Petitioner 13) Rival 14) Semifinalist 15) Sportsperson 16) Tilter 
• (n.) One who seeks what another seeks, or claims what another claims; one who competes; a rival. • (n.) An associate; a confederate.
A business rival, usually one who manufactures or sells similar goods and/or services
Com·pet'i·tor noun [ Latin : confer French compétiteur .] 1. One who seeks what another seeks, or claims what another claims; one who competes; a rival. « And can not brook competitors in love. Shak. » 2. An associate; a confederate. [ Obsolete] &#...
something that competes or the enemy
a person, team, company, etc., that competes; rival.
the contestant you hope to defeat