accroach vs usurp

accroach

verb
  • To hook, or draw to oneself as with a hook. 

  • To usurp, as jurisdiction or royal prerogatives. 

  • To encroach. 

usurp

verb
  • To use and assume the coat of arms of another person. 

  • To take the place rightfully belonging to someone or something else. 

  • To seize power from another, usually by illegitimate means. 

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