buskin vs combat boot

buskin

noun
  • A type of half-boot with a high heel, worn by the ancient Athenian tragic actors. 

  • A half-boot. 

  • Tragic drama; tragedy. 

  • An instrument of torture for the foot; bootikin. 

combat boot

noun
  • A type of boot designed to be worn by soldiers during actual combat or combat training 

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