opponent
🇺🇸
/əˈpəʊnənt/
🇬🇧
/əˈpəʊnənt/
A person you compete against in a game, sport, or argument.
In chess, you must think carefully about your opponent's next move.
A person who disagrees with something and tries to stop it.
She is a strong opponent of the new law and speaks against it often.