Opponent and Revolter

Opponent noun - One that takes a position opposite another in a competition or conflict.

Revolter and opponent are semantically related In some cases you can use "Revolter" instead a noun "Opponent".

Revolter noun - A person who rises up against authority.

Opponent and revolter are semantically related in rebel topic. Sometimes you can use "Opponent" instead a noun "Revolter", if it concerns topics such as person who does not obey.