protestors

/P R OW1 T EH0 S T ER0 Z/
noun
  1. 1

    One who protests, either singly or in a public display of group feeling.

    โ€œThe protesters thronged Trafalgar Square and sang anti-war songs.โ€

  2. 2

    One who protests a bill of exchange, or note.

Source: https://en.wiktionary.org/wiki/protester, https://en.wiktionary.org/wiki/protestor, https://en.wiktionary.org/wiki/protestors