Anti-torque rotor and Tail rotor

Anti-torque rotor noun - Rotor consisting of a rotating airfoil on the tail of a single-rotor helicopter; keeps the helicopter from spinning in the direction opposite to the rotation of the main rotor.

Tail rotor is a synonym for anti-torque rotor. In some cases you can use "Tail rotor" instead a noun phrase "Anti-torque rotor".

Tail rotor noun - Rotor consisting of a rotating airfoil on the tail of a single-rotor helicopter; keeps the helicopter from spinning in the direction opposite to the rotation of the main rotor.

Anti-torque rotor is a synonym for tail rotor. You can use "Anti-torque rotor" instead a noun phrase "Tail rotor".