推进器 (推進器) tuī​jìn​qì
propeller noun
a mechanical device with rotating blades used to propel a ship or aircraft

The submarine's thrusters make very little noise underwater.

thruster noun
a device or engine that provides propulsion or reactive force, especially for spacecraft or rockets

Satellites use small thrusters to adjust their orbits.

Frequency

Written text
0.018 per million

Sources

Frequency data
BCC Corpus (BLCU)