consort vs vassal

consort

adj
  • of a title, by virtue of one's (living) spouse; often contrasted with regnant and dowager 

verb
  • To be in agreement. 

  • To associate or keep company (with). 

noun
  • The spouse of a monarch. 

  • A ship accompanying another. 

  • Association or partnership. 

  • A group or company, especially of musicians playing the same type of instrument. 

  • A husband, wife, companion or partner. 

  • An informal, usually well-publicized sexual companion of a monarch, aristocrat, celebrity, etc. 

vassal

adj
  • Resembling a vassal; slavish; servile. 

verb
  • To treat as a vassal or to reduce to the position of a vassal; to subject to control; to enslave. 

  • To subordinate to someone or something. 

noun
  • The grantee of a fief, a subordinate granted use of a superior's land and its income in exchange for vows of fidelity and homage and (typically) military service. 

  • Any subordinate bound by similar close ties. 

  • Any direct subordinate bound by such vows to a superior. 

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