codeword vs nonce

codeword

noun
  • A string representing an encoded piece of text. 

  • A type of crossword puzzle where the letters of the alphabet are represented by numbers and the solver must identify them by their position and frequency. 

  • A word or phrase (or by extension a concept) used to make a (concealed) reference to another word or concept. 

nonce

noun
  • A value constructed so as to be unique to a particular message in a stream, in order to prevent replay attacks. 

  • A sex offender, especially one who is guilty of sexual offences against children. 

  • A nonce word. 

  • A pedophile. 

  • A stupid or worthless person. 

  • A police informer, one who betrays a criminal enterprise 

  • The one or single occasion; the present reason or purpose (now only in for the nonce). 

adj
  • One-off; produced or created for a single occasion or use. Denoting something occurring once. 

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