Dissenter

Part of speech: noun (n.)

1. One who dissents; one who differs in opinion, or declares his disagreement.

2. One who separates from the service and worship of an established church; especially, one who disputes the authority or tenets of the Church of England; a nonconformist. Dissenters from the establishment of their several countries. Burke. Robert Brown is said to have the first formal dissenter. Shipley.