mistress vs prexy

mistress

noun
  • A woman, specifically one with great control, authority or ownership 

  • The other woman in an extramarital relationship, generally including sexual relations 

  • A female companion to a master (a man with control, authority or ownership) 

  • a woman regarded with love and devotion; a sweetheart 

  • A married woman; a wife 

  • A female teacher 

  • A dominatrix 

  • A woman well skilled in anything, or having the mastery over it 

verb
  • To act or take the role of a mistress. 

  • Of a woman: to master; to learn or develop to a high degree of proficiency. 

prexy

noun
  • A president, especially of a college or university. 

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