overbear vs overburden

overbear

verb
  • To prevail over; to dominate, overpower; to oppress. 

  • To push through by physical weight or strength; to overwhelm, overcome. 

  • To produce an overabundance of fruit. 

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. 

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