BabelNet

A powerful circular current of water (usually the result of conflicting tides) WordNet 3.0 & Open English WordNet

A whirlpool is a body of rotating water produced by opposing currents or a current running into an obstacle. Wikipedia

In fluid dynamics, a vortex is a region in a fluid in which the flow revolves around an axis line, which may be straight or curved. Wikipedia

A powerful whirlpool Wikipedia Disambiguation

Swirling body of water. Wikipedia Disambiguation

Dynamic phenomenon of fluids. Wikipedia Disambiguation

Fluid flow revolving around an axis of rotation Wikidata

Very powerful whirlpool Wikidata

Body of swirling water Wikidata

A whirlwind, whirlpool, or similarly moving matter in the form of a spiral or column. OmegaWiki

A rapidly rotating body of water. OmegaWiki

Whirlpool. Wiktionary (translation)