lumber vs overtask

lumber

verb
  • To load down with things, to fill, to encumber, to impose an unwanted burden on. 

  • To fill or encumber with lumber. 

  • To move clumsily and heavily; to move slowly. 

  • To heap together in disorder. 

noun
  • An erect penis. 

  • Useless or cumbrous material. 

  • A baseball bat. 

  • Wood sawn into planks or otherwise prepared for sale or use, especially as a building material. 

overtask

verb
  • To task too heavily; to give someone or something too many tasks; to overburden. 

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