extemporizer

/ɪkˈstɛmpəraɪzər/
noun
  1. A person who speaks or performs without preparation or rehearsal; an improviser.
    • As an extemporizer, he never used notes during his lectures.
    • She is a skilled extemporizer, able to give a talk on any topic.
    • The best jazz musicians are natural extemporizers.
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