experimental vs psychotropic

experimental

adj
  • Serving as an experiment; serving to experiment. 

  • Pertaining to or founded on experiment. 

  • Experiential, empirical. 

  • Serving to be experimented upon; used in an experiment. 

noun
  • The subject of an experiment. 

psychotropic

adj
  • Affecting the mind or mental processes. 

noun
  • A psychotropic drug or agent. 

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