provocative vs somnific

provocative

adj
  • Serving or tending to elicit a strong, often negative sentiment in another person; exasperating. 

  • Serving or tending to excite, stimulate or arouse sexual interest; sexy. 

somnific

adj
  • Causing sleep; somniferous. 

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