improvisator

/ɪmˈprɑvɪˌzeɪtər/
noun
  1. A person who improvises, especially in music, theater, or speech.
    • As an improvisator, she could turn any audience suggestion into a hilarious scene.
    • The jazz club featured an improvisator who played the saxophone without any sheet music.
    • The street performer was a skilled improvisator who could make up songs on the spot.
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