landfill vs muckheap

landfill

noun
  • A site at which refuse is buried under layers of earth. 

  • The material so disposed of. 

verb
  • To dispose of (garbage) by burying it at a landfill site. 

muckheap

noun
  • dunghill; dung heap 

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