#responder__respondent__answerer  someone who responds
  supertype:  communicator  a person who communicates with others
  subtype:  equivocator__hedger  a respondent who avoids giving a clear direct answer
  subtype:  interviewee  a person who is interviewed
     subtype:  don't-know__don'tknow  (colloquial) a person who responds "I don't know" in public opinion poll
  subtype:  testee__examinee  someone who is tested (as by an intelligence test or an academic examination)
     subtype:  passer  a student who passes and examination

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