coward vs retromingent

coward

adj
  • Cowardly. 

  • Borne in the escutcheon with his tail doubled between his legs. 

noun
  • A person who lacks courage. 

retromingent

adj
  • Cowardly. 

  • That urinates backwards; also used of such urination. 

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