overburden vs overplay

overburden

verb
  • To overload or overtax. 

noun
  • A sterile stratum that lies above the stratum being investigated 

  • The rock and subsoil that lies above a mineral deposit such as a coal seam. 

overplay

verb
  • To overdo or overact one's effect or role. 

  • To play (a song or record) too frequently. 

  • To accidentally hit (one's golf ball) beyond "the green". 

  • To overestimate one's strength in a game or event, which ultimately may end in a defeat. 

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