caitiff vs saprophage

caitiff

noun

  • A base or despicable person; a wretch 

adj

  • Especially despicable; cowardly 

saprophage

noun

  • A degenerate person; a wastrel. 

  • A detritivore. 

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