What is A synonym for advasary?

Here are some synonyms for "adversary," depending on the context:

General:

* Opponent

* Enemy

* Foe

* Antagonist

* Competitor

* Contender

More specific:

* Rival (for a specific position or goal)

* Nemesis (a powerful and recurring enemy)

* Protagonist (in a story, the adversary of the main character)

* Accuser (in a legal context)

* Opponent (in a debate or argument)

The best synonym will depend on the specific meaning you want to convey.