1) Contributor of two cents 2) Donator of two cents 3) Editorial writer, essentially 4) Judge, at work 5) One expressing views 6) One speaking out 7) One who hazards a guess 8) One who says what he thinks 9) One who speaks his mind 10) One who states his views 11) One with a thought 12) One with ideas to express 
• (n.) One who opines.
O·pin'er noun One who opines. Jer. Taylor.