Rapper

noun

1. One who, or that which, raps or knocks.
2. A performer of rap music, or someone who raps in any form of music.

   "He rose from the ghetto to become a successful rapper."

3. A sword.
4. A flexible strip of metal, 45-60cm long, with handles at each end, used for Northumbrian rapper sword dancing.
5. A mechanical, or later electric, signalling device formerly used in the mines of north-eastern England to signal to the engineman that the cages carrying men or coals up and down the shaft were ready to be raised or lowered.