compel vs overtask

compel

verb
  • To overpower; to subdue. 

  • To force, constrain or coerce. 

  • To exact, extort, (make) produce by force. 

overtask

verb
  • To task too heavily; to give someone or something too many tasks; to overburden. 

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