protester

One who protests; one who utters a solemn or formal declaration.

One who protests a bill of exchange, etc.

[capitalized] Specifically, in Scottish history, a member of a party which protested against the union of the Royalists with the Presbyterians in 1650. Also spelled Protestor.

One who protests; one who utters a solemn declaration.

One who protests a bill of exchange, or note.