Formal:
* Quizmaster: This is the most common and formal term, often used for pub quizzes or game shows.
* Quiz host: Similar to quizmaster, but can be used in more casual settings.
* Moderator: This term is used when the person leads the quiz but doesn't necessarily ask all the questions.
Informal:
* Quizzer: This term is less common, but can be used in casual settings.
* Questioner: This emphasizes the asking of questions.
* Leader: This is a general term that can be used in any quiz format.
Ultimately, the best term to use depends on the specific situation and the tone you want to convey.