inquirer (n.)

• asker
• auditor
• autodidact
• busybody
• catechist
• cross-questioner
• detective
• eavesdropper
• educatee
• examiner
• gossip
• inquisitor
• interlocutor
• interrogator
• interviewer
• learner
• monitor
• pollster
• prefect
• pry
• pupil
• querier
• questioner
• quidnunc
• quizzer
• rubberneck
• rubbernecker
• sampler
• scholar
• sightseer
• snoop
• snooper
• student
• trainee
• voyeur
• yenta