nates vs rear end

nates

noun

  • The buttocks. 

  • The umbones of a bivalve shell. 

  • The two anterior of the four lobes on the dorsal side of the midbrain of most mammals; the anterior optic lobes. 

rear end

noun

  • The buttocks. 

  • The back or hindmost part of anything, such as a car. 

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