atypical vs psychotropic

atypical

noun

  • An atypical antipsychotic. 

adj

  • Unusual or irregular. 

  • Not conforming to the normal type. 

psychotropic

noun

  • A psychotropic drug or agent. 

adj

  • Affecting the mind or mental processes. 

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