re sister (noun) resister: opponent
Sinonime: adversary,
antagonist,
anti*, aspirant,
assailant,
bandit*, bidder,
candidate, challenger,
competitor,
con, contestant, counteragent, dark horse, disputant, dissentient,
enemy, entrant,
foe, litigant,
match, opposer,
opposition, oppositionist, oppugnant,
player,
rival