Partisan and Proponent

Partisan noun - A fervent and even militant proponent of something.

Proponent is a synonym for partisan in advocate topic. In some cases you can use "Proponent" instead a noun "Partisan", when it comes to topics like supporter.

Nearby Word: partisanship

Proponent noun - A person who actively supports or favors a cause.

Partisan is a synonym for proponent in supporter topic. You can use "Partisan" instead a noun "Proponent", if it concerns topics such as advocate, supports cause.