breastbone vs wishbone

breastbone

noun
  • The central narrow bone in the front of the chest, connecting the collarbone and the top ribs. 

wishbone

noun
  • A forked bone between the neck and breast of a bird consisting chiefly of the two clavicles fused at their median or lower end, regarded as a lucky charm in some countries. 

  • A suspension component similar in shape to a chicken wishbone. 

  • Any sailing vessel rigged with a wishbone. 

  • A particular kind of offensive formation. See wishbone formation. 

  • A spar in two parts, between which a sail is hoisted, the wishbone extending its clew. 

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