operant vs sympathetic

operant

adj
  • That operates to produce an effect. 

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

  • An operative person or thing. 

sympathetic

adj
  • Relating to, producing, or denoting an effect which arises through an affinity, interdependence, or mutual association. 

  • A supernatural connection or power resulting from two items having the same form or some other correspondence. 

  • Designed in a sensitive or appropriate way. 

  • Relating to musical tones produced by sympathetic vibration or to strings so tuned as to sound by sympathetic vibration. 

  • Showing approval of or favor towards an idea or action. 

  • Relating to or denoting the part of the autonomic nervous system consisting of nerves arising from ganglia near the middle part of the spinal cord, supplying the internal organs, blood vessels, and glands, and balancing the action of the parasympathetic nerves. 

  • Of, related to, feeling, showing, or characterized by sympathy. 

  • Attracting the liking of others. 

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