Propulsor

The word is commonly used in the marine vernacular, and implies a mechanical assembly that is more complicated than a propeller.

The stator concentrates the thrust in axial direction and reduces energy wasted in the tangential flow (therefore eliminating torque on the hull).

The Voith Schneider Propeller, also known as a cycloidal drive is a specialized marine propulsion system.

An azimuth thruster is a configuration of ship propellers placed in pods that can be rotated on the horizontal plane, making a rudder unnecessary.

A magnetohydrodynamic drive was featured in the 1990 film The Hunt for Red October, differing from the pump jet propulsion system featured in the Tom Clancy novel The Hunt for Red October upon which the movie was based.