matriarch vs rebbe

matriarch

noun
  • A female leader of a family, a tribe or an ethnic or religious group. 

  • A female founder of a political or religious movement, an organization or an enterprise. 

  • The dominant female in a family group of elephants 

rebbe

noun
  • The spiritual leader of a Hasidic Jewish community. 

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