Countercurrent and Gyre

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

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

Gyre noun - A round shape formed by a series of concentric circles (as formed by leaves or flower petals).

Countercurrent and gyre are semantically related. Sometimes you can use "Countercurrent" instead a noun "Gyre".