Clear vs operant

Clear

noun
  • An idea state of beingness free of unwanted influences. 

operant

noun
  • Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment. 

  • An operative person or thing. 

adj
  • That operates to produce an effect. 

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