Coward

Antonyms of coward:
brave, courageous, fearless, daredevil, hero, stalwart, valiant.
Examples of usage:
  1. I shall not rest until the coward who killed him has been brought to justice!"
    "The Crevice", William John Burns and Isabel Ostrander.
  2. To ask a chap to do a noble deed and in the same breath to tell him he is a coward!
    "Harding's luck", E. [Edith] Nesbit.
  3. He don't fight like no coward.
    "The Major", Ralph Connor.