clandestinity vs secrecy

clandestinity

noun
  • The quality or state of being clandestine. 

  • A diriment impediment in the canon law of the Roman Catholic Church, requiring the presence of witnesses to the marriage vows, one of whom must be a priest or a deacon. 

secrecy

noun
  • Concealment; the condition of being secret or hidden. 

  • The habit of keeping secrets. 

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