governor vs headword

governor

noun
  • A constituent of a phrase that governs another. 

  • A device which regulates or controls some action of a machine through automatic feedback. 

  • A member of a decision-making for an organization or entity (including some public agencies) similar to or equivalent to a board of directors (used especially for banks); a member of the board of governors. 

  • A pilot; a steersman. 

  • Father. 

  • Boss; employer; gaffer. 

  • The chief executive officer of a first-level division of a country. 

headword

noun
  • Any word which may be modified by an adjunct. 

  • A word used as the title of a section, particularly in a dictionary, encyclopedia, or thesaurus. 

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