cryptology vs locution

cryptology

noun
  • Secret or enigmatical language. 

  • The science or study of mathematical, linguistic, and other coding patterns and histories. 

  • The practice of analysing encoded messages, in order to decode them. 

locution

noun
  • The use of a word or phrase in an unusual or specialized way. 

  • A phrase or expression connected to an individual or a group of individuals through repeated usage. 

  • A supernatural revelation where a religious figure, statue or icon speaks, usually to a saint. 

  • Style of discourse or usage, or any particular utterance in such style. 

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