burrow vs scrapheap

burrow

noun
  • A heap or heaps of rubbish or refuse. 

  • A tunnel or hole, often as dug by a small creature. 

verb
  • (with adverbial of direction) to move underneath or press up against in search of safety or comfort 

  • (with into) to investigate thoroughly 

  • to dig a tunnel or hole 

scrapheap

noun
  • A pile in which junk is discarded. 

  • A junkyard. 

  • A collection of discarded or rejected items or ideas. 

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