foe

a person or group that you oppose or dislike very much

enemigo, adversario

Collocations foe in battle

• He was seen as a political foe.

  Se le consideraba un enemigo político.

a person or group that you compete against in sports, games, etc.

rival, oponente

Collocations foe in competition

• Our next foe is the Manchester United team.

  Nuestro próximo rival es el equipo de Manchester United.