musical saw vs sawmill

musical saw

noun
  • A musical instrument consisting of a thin sheet of metal, or sometimes a saw, usually played with a bow. 

sawmill

noun
  • A machine, building or company used for cutting (milling) lumber. 

verb
  • To process (lumber) in a sawmill. 

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