clacker

/ˈklækər/
noun
  1. A person or thing that makes a sharp clicking or clacking sound.
    • He's a constant clacker with his pen during meetings.
    • The wooden toy was a simple clacker that kids loved.
    • The old typewriter was a noisy clacker.
  2. A device or part of a machine that produces a clicking noise, especially in a mechanical counter or signal.
    • He fixed the clacker on the old adding machine.
    • The train signal's clacker warned of the approaching crossing.
    • The voting machine's clacker sounded with each ballot cast.
Antonyms
What does "clacker" mean? | whatsthatwordmean | whatsthatwordmean