clergywoman vs imam

clergywoman

noun
  • A woman belonging to a clergyman's family. 

  • An ordained (female) Christian minister; a female member of the clergy. 

imam

noun
  • One who leads the salat prayers in a mosque. 

  • A Shi'ite Muslim leader descended from the prophet Muhammad and functioning as his spiritual successor. 

  • One of the Twelve imams, descendants of Muhammad from the seventh to ninth centuries CE who lived exemplary lives. 

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