Countercurrent and Whirlwind

Countercurrent noun - A stretch of turbulent water in a river or the sea caused by one current flowing into or across another current.

Whirlwind and countercurrent are semantically related. In some cases you can use "Whirlwind" instead a noun "Countercurrent".

Whirlwind noun - A more or less vertical column of air whirling around itself as it moves over the surface of the Earth.

Countercurrent and whirlwind are semantically related. You can use "Countercurrent" instead a noun "Whirlwind".