enemy

Noun

• a personal enemy
  • they had been political foes for years
    

• any hostile group of people
  • he viewed lawyers as the real enemy
    

• an armed adversary (especially a member of an opposing military force)
  • a soldier must be prepared to kill his enemies
    

• an opposing military force
  • the enemy attacked at dawn
    

Related words

• Synonyms: 
  foe , foeman , opposition
• Antonyms: 
  ally , friend