opponent

noun1 of 2

a person that you are competing against in a game or contest

• “You gain one point for every opponent piece you capture.”Tatoeba
• “Opponents of the bill come from across the political spectrum.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

adjective2 of 2

Opposing; adverse; antagonistic.