mire vs overburden

mire

noun
  • Deep mud; moist, spongy earth. 

  • An undesirable situation, a predicament. 

verb
  • To cause or permit to become stuck in mud; to plunge or fix in mud. 

  • To sink into mud. 

  • To weigh down. 

  • To soil with mud or foul matter. 

overburden

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

  • A sterile stratum that lies above the stratum being investigated 

verb
  • To overload or overtax. 

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