Airfoil and Flaps

Airfoil noun - A device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight.

Flaps and airfoil are semantically related. In some cases you can replace term "Flaps" with "Airfoil", this nouns are similar.

Flaps noun - A movable airfoil that is part of an aircraft wing; used to increase lift or drag.

Airfoil and flaps are semantically related. Sometimes you can use "Airfoil" instead a noun "Flaps".