reformer vs zealot

reformer

noun
  • One who was involved in the Reformation. 

  • One who reforms, or who works for reform. 

  • A device used to convert petroleum refinery naphthas, typically having low octane ratings, into high-octane liquid products called reformates. 

  • A device which converts hydrocarbons into a hydrogen-rich mixture of gases. 

zealot

noun
  • A member of a radical, warlike, ardently patriotic group of Jews in Judea, particularly prominent in the first century, who advocated the violent overthrow of Roman rule and vigorously resisted the efforts of the Romans and their supporters to convert the Jews. 

  • One who is zealous, one who is full of zeal for his own specific beliefs or objectives, usually in the negative sense of being too passionate; a fanatic. 

  • A member of an anti-aristocratic political group in Thessalonica from 1342 until 1350. 

How often have the words reformer and zealot occurred in a corpus of books? (source: Google Ngram Viewer )