remonstrator

/rɪˈmɑnstreɪtər/
noun
  1. A person who protests or argues against something, often in a formal or forceful way.
    • As a remonstrator, she spoke passionately against the new policy at the town meeting.
    • The remonstrator stood outside the building with a sign, demanding change.
    • The remonstrator's arguments were well-reasoned, but the committee did not change its decision.
Antonyms
What does "remonstrator" mean? | whatsthatwordmean | whatsthatwordmean