One who guests or appears as a guest, especially in entertainment contexts.
From 'guest' (verb) plus agent suffix '-er.' A modern coinage that treats 'guest' as a productive verb and applies standard agent-noun formation.
Words like 'guester' (one who guests) show English's systematic productivity—even though 'guest' as a verb is recent, the '-er' suffix automatically generates the corresponding agent noun, making English speakers understand new occupational terms intuitively.
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