care for vs overburden

care for

verb
  • To attend to the needs of, especially in the manner of a nurse or personal aide. 

  • To like or appreciate; to consider to be appealing, tasteful, or suitable. 

overburden

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. 

verb
  • To overload or overtax. 

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