improvisor

/ˈɪmprəˌvaɪzər/
noun
  1. A person who creates or performs something spontaneously without preparation, especially in music, theater, or comedy.
    • The jazz club featured an amazing improvisor who could create melodies on the spot.
    • The best improvisors in theater can turn a simple suggestion into a full scene without a script.
    • As an improvisor in the comedy troupe, she always kept the audience laughing with her quick wit.
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