Related Clues:

• Bizarro, to Superman
• A McCoy, to a Hatfield
• One to go up against
• Close competitor
• A century in Washington: Abbr.
• Macduff, to Macbeth
• Axis powers, to the Allies
• Someone to keep closer
• One against another
• Adversary in war
• Opposing military force
• Cap. Hill 100
• Nearby school, maybe
• Members in a 100-member club (Abbr.)
• Very tough thing to lick