applauder

/əˈplɔdər/
noun
  1. A person who claps their hands together to show approval or enjoyment, especially after a performance or speech.
    • Every applauder in the theater rose to their feet after the final scene.
    • The speaker thanked the applauders for their warm reception.
    • Among the crowd, one enthusiastic applauder clapped louder than anyone else.
  2. A person who expresses strong approval or praise for someone or something.
    • The book received many positive reviews, and its author gained a loyal applauder in the critic.
    • As an applauder of innovation, he always supported new technology in the classroom.
    • She was a vocal applauder of the new environmental policies.
Antonyms
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