half-moon vs oxbow

half-moon

noun
  • A semicircular or crescent-shaped Filipino butter cookie. 

  • The moon in its first or last quarter when only half the visible face is illuminated; a quarter moon. 

  • Anything shaped like a crescent, especially the base of a fingernail. 

  • Synonym of black and white (“type of cookie”) 

oxbow

noun
  • A U-shaped piece of wood used as a collar for an ox, the upper parts fastened to its yoke 

  • A meander in a river; the land enclosed by such a loop 

How often have the words half-moon and oxbow occurred in a corpus of books? (source: Google Ngram Viewer )