Poltroon
Part of speech: noun
Definition: An ignoble or total coward; a dastard; a mean-spirited wretch.
Part of speech: adjective
Definition: Cowardly
Craven
Part of speech: adjective
Definition: Unwilling to fight; lacking even the rudiments of courage; extremely cowardly.
Part of speech: noun
Definition: A confessed coward.
Part of speech: verb
Definition: To make craven.