noun (n)

• a disputant who advocates reform(noun.person)

  Synonym:
  crusader, meliorist, reformist, social reformer
  

  source: wordnet30
• an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel(noun.artifact)

  Example:
  A catalytic reformer.
  

  source: wordnet30
• One who effects a reformation or amendment; one who labors for, or urges, reform; as, a reformer of manners, or of abuses.(noun)

  source: webster1913