Opponent
Part of speech: noun
Definition: An individual or group who is a rival of another. One who attempts to stop the progression of. One who objects to. In team sports, a player of an opposite team.
Example sentence: When I'm ready to fight, my opponent has a better chance of surviving a forest fire wearing gasoline drawers.
Antagonist
Part of speech: noun
Definition: An opponent or enemy.One who antagonizes or stirs.A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.The main character opposing the protagonist in a literary work or drama.
Example sentence: In all our pictures, we had an antagonist who becomes the good guy, and the underdog fulfills his quest.