Leader, writer, reader, visitor, speaker, sleeper, actor, director, conductor, driver, fighter, miner, reporter, singer, skater, swimmer, teacher, traveler, sailor, inventor, founder, composer.
Beautiful, thankful/thankless, hopeless/hopeful, doubtful/doubtless, careful/careless, aimless, useful/useless, shapeless, fruitful/fruitless, powerful/powerless, thoughtful/thoughtless, harmful/harmless, colourful/colourless.