tickling vs titillation

tickling

noun
  • A sensation that tickles. 

  • The act by which someone is tickled. 

adj
  • That tickles 

titillation

noun
  • A pleasurable or sexually exciting sensation. 

  • The process or outcome of titillating. 

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