thruster

Short definition from Wiktionary

Noun

1. 1
   One who thrusts, who pushes or stabs.
2. 2
   A device for propelling an object, especially a spacecraft or a ship (marine vessel).
3. 3
   A bow thruster or a stern thruster.
4. 4
   A surfboard (usually a shortboard) with three fins of approximately equal size, one centred at the back, one on each side about 25cm forward and out near the rails.
5. 5
   An ambitious, driven person; a go-getter.