introducer vs matriarch

introducer

noun
  • Someone or something that introduces. 

matriarch

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

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

  • The dominant female in a family group of elephants 

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