Clocks and Flaps

Clocks noun - European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage.

Flaps and clocks are semantically related. In some cases you can use "Flaps" instead a noun "Clocks".

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

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