stimulation vs tickling

stimulation

noun
  • A pushing or goading toward action. 

  • An activity causing excitement or pleasure; the act of stimulating. 

  • Any action or condition that creates a response; sensory input. 

tickling

noun
  • The act by which someone is tickled. 

  • A sensation that tickles. 

adj
  • That tickles 

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