overextend vs overwork

overextend

verb
  • To apply (a term) to too many referents, by overextension. 

  • To push a pawn too far, so that it becomes vulnerable to the opponent's attacks. 

  • To expand or extend to an excessive degree, especially to do so beyond a safe limit. 

overwork

verb
  • To work too hard. 

  • To make (someone or something) work too hard. 

  • To decorate all over. 

  • To fill too full of work; to crowd with labour. 

noun
  • excessive work 

  • a superstructure 

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