rapper

Short definition from Wiktionary

Noun

1. 1
   One who, or that which, raps or knocks: The knocker of a door.
2. 2
   One who, or that which, raps or knocks: A swinging knocker for making signals at the mouth of a shaft.
3. 3
   One who, or that which, raps or knocks: A spiritualistic medium who claims to receive communications from spirits in the form of knocking sounds.
4. 4
   A performer of rap music, or someone who raps in any form of music.
5. 5
   A sword.
6. 6
   A flexible strip of metal, 45-60cm long, with handles at each end, used for Northumbrian rapper sword dancing.
7. 7
   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.
8. 8
   A bold lie; a whopper.
9. 9
   A loud oath.