| inquisitor(noun, person, investigate, ask, agent) |
| querier(noun, person, investigate, ask, inquirer) |
| asker(noun, examiner) |
| inquirer(noun, person, investigate, ask, agent) |
| analyst(noun, person, agent, hound, investigator) |
| interrogator(noun, person, investigate, ask, tester) |
| investigator(noun, person, investigate, ask, tester) |
| cynic(noun, radical, revolutionary, detractor, unbelieving) |
| disbeliever(noun, verb, doubter) |
| enquirer |
| examiner(noun, agent, hound, checker, inspector) |
| prober(noun, person, investigate, ask, agent) |
| doubter(noun, person, detractor, cynic, unbelieving) |
| unbeliever(noun, radical, detractor, cynic, unbelieving) |
| agnostic(noun, doubter) |
| interlocutor(noun, conversationalist) |
| interviewer(noun, speaker, examiner, talker, interrogator) |
| pollster |
| sceptic(noun, radical, revolutionary, critic, detractor) |
| querist |