rival

noun 0.796

archnemesis

noun 0.769

archenemy

noun 0.738

rivalry

noun 0.696

competitor

noun 0.642

adversary

noun 0.640

worst enemy

noun 0.601

archfiend

noun 0.592

opponent

noun 0.591

foe

noun 0.590

enemy

noun 0.585

antagonist

noun 0.571

nemesis

noun 0.564

archdemon

noun 0.543

sibling rivalry

noun 0.526

archbishop

noun 0.520

frenemy

noun 0.517

evil twin

noun 0.505

challenger

noun 0.502

contender

noun 0.502