Synonyms and related words :
analyst, analyzer, asker, catechist, cross-interrogator, cross-questioner, detective, examinant, inquirer, inquisitionist, inquisitor, inspector, interlocutor, interpellator, interrogator, interrogatrix, interviewer, investigator, observer, opinion-sampler, poller, pollster, prober, querier, querist, questioner, questionist, quizzer, sampler, scrutineer, secret agent, tester, visitator, visitor