operant vs running

operant

noun
  • An operative person or thing. 

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

adj
  • That operates to produce an effect. 

running

noun
  • The act of running errands. 

  • That which runs or flows; the quantity of a liquid which flows in a certain time or during a certain operation. 

  • The discharge from an ulcer or other sore. 

  • The activity of running as a form of exercise, as a sport, or for any other reason. 

  • The action of the verb to run. 

adv
  • Consecutively; in a row. 

adj
  • Extending by a slender climbing or trailing stem. 

  • Of a horse, having a running gait; not a trotter or pacer. 

  • Consecutive (much more commonly expressed by an adverb; see below). 

  • Continuous; ongoing; keeping along step by step. 

  • Moving or advancing at a run. 

  • Present, current. 

  • Having a continuous design or pattern. 

  • Discharging snot or mucus. 

  • Flowing; easy; cursive. 

  • Discharging pus. 

prep
  • Approaching; about; roughly. 

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