crusader

noun

1. a disputant who advocates reform

   noun.person

   Synonyms meliorist reformer reformist social reformer

   Source: WordNet 3.0

2. a warrior who engages in a holy war

   noun.person

   Examples

   The Crusaders tried to recapture the Holy Land from the Muslims.

   Source: WordNet 3.0

3. One engaged in a crusade; as, the <i>crusaders</i> of the Middle Ages.

   noun

   Source: webster1913