tapper

Noun

1. One who makes a tapping noise.
   • A low tap was heard at the room door. Mr. Bob Sawyer looked expressively at his friend, and bade the tapper come in[…] - 1836 March – 1837 October, Charles Dickens, “(please specify the chapter name)”, in The Posthumous...
2. A tap-dancer.
3. A wiretapper.
4. A weakly hit ground ball.
5. In early wireless telegraphs, a device used to shake loose the filings of a coherer.
6. The lesser spotted woodpecker.
7. A tapster.
8. An assistant in the sport of paraswimming who taps blind or visually impaired swimmers with a pole to indicate when they should turn around.