A questioner is someone who asks questions, especially in an official or formal capacity. When a detective interviews a suspect, she acts as a questioner.

A questioner is also an interviewer, so if you're producing a radio piece, asking people on the street various questions, you are a questioner. An FBI agent trying to get to the bottom of a case is also a questioner, and so is someone who asks a question at a public event, like a lecture. You are also a questioner if you are having doubts about something, especially religious tenets — you're questioning them.

Definitions of questioner

n someone who asks a question

asker, enquirer, inquirer, querier
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cross-examiner, cross-questioner
someone who questions a witness carefully (especially about testimony given earlier)
examiner, quizzer, tester
someone who administers a test to determine your qualifications
inquisitor, interrogator
a questioner who is excessively harsh
a person who conducts an interview
canvasser, headcounter, poll taker, pollster
someone who conducts surveys of public opinion
Type of:
speaker, talker, utterer, verbaliser, verbalizer
someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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