1. (n.) One who protests; one who utters a solemn declaration.

2. (n.) One who protests a bill of exchange, or note.

apostate bitter-ender brawler defendant demurrer diehard disputant dissenter dissentient dissident intransigent irreconcilable last-ditcher litigant naysayer negativist nonconformist noncooperator objector obstructionist obstructive opinionist opposer opposition voice oppositionist plaintiff protestant quarreler recusant resister schismatic scrapper sectarian sectary separatist wrangler