cryptogram vs enigma

cryptogram

noun
  • A type of word puzzle in which text encoded by a simple cipher is to be decoded. 

  • Encrypted text. 

enigma

noun
  • Riddles and puzzles, collectively. 

  • A species of grasshopper, Oedaleonotus enigma. 

  • A riddle, or a difficult problem. 

  • Mysteriousness; obscurity; lack of clarity. 

  • The Talaud kingfisher, Todiramphus enigma. 

  • A rare species of moth, Heliothis enigma. 

  • A style of literature characterized by obscurity and hints of transcendental meaning. 

  • Something or someone puzzling, mysterious or inexplicable. 

  • A protein with three LIM domains (a conserved cysteine- and histidine-rich structure of two adjacent zinc fingers) at the C terminus that regulates protein phosphorylation. 

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