co-wife vs consort

co-wife

noun
  • In a polygamous marriage, another wife of a woman’s husband. 

consort

noun
  • A husband, wife, companion or partner. 

  • 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. 

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

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). 

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