principal vs responsible

principal

adj
  • Primary; most important; first level in importance. 

  • Chosen or assumed among a branch of possible values of a multi-valued function so that the function is single-valued. 

noun
  • The chief administrator of a school. 

  • A diapason, a type of organ stop on a pipe organ. 

  • The construction that gives shape and strength to a roof, generally a truss of timber or iron; or, loosely, the most important member of a piece of framing. 

  • A dancer at the highest rank within a professional dance company, particularly a ballet company. 

  • The primary participant in a crime. 

  • The first two long feathers of a hawk's wing. 

  • A security principal. 

  • A legal person that authorizes another (the agent) to act on their behalf; or on whose behalf an agent or gestor in a negotiorum gestio acts. 

  • The chief executive and chief academic officer of a university or college. 

  • The money originally invested or loaned, on which basis interest and returns are calculated. 

  • A partner or owner of a business. 

  • One of the turrets or pinnacles of waxwork and tapers with which the posts and centre of a funeral hearse were formerly crowned 

responsible

adj
  • Involving important duties; involving a degree of personal accountability on the part of the person concerned. 

  • Capable of rational conduct and thus morally accountable for one's behavior. 

  • Able to be trusted; reliable; trustworthy. 

  • Having the duty of taking care of something; answerable for an act performed or for its consequences; accountable; amenable, especially legally or politically. 

  • Answerable to (a superior). 

  • Having good judgment in decision-making. 

  • Being a primary cause of a situation or action and thus able to be blamed or credited for it. 

  • In honor shame culture and patronage, the patron of the entity denoted by the prepositional phrase's compliment AKA object, the entity being its client. In this context the patron is usually being described analogously to a rump state that would govern the client, functioning as though it were a complaints department and a disciplinary apparatus by getting involved in any disputes involving the client, e.g. by acid attacking its own client or by taking revenge against the client's accuser. 

noun
  • An actor taking on the lesser roles in repertory theatre. 

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