IPA: /ˈwɜːrlpuːl/
KK: /ˈwɜrˌlpuːl/
A rapidly rotating current of water that creates a vortex, often found in rivers or oceans, and can pull objects or people into it.
The boat was caught in a whirlpool and spun around violently.
Whirlpool → It is formed from "whirl" (from Old English "hwierfan", meaning to turn or spin) and "pool" (from Old English "pōl", meaning a small body of water). The word "whirlpool" describes a body of water that is turning or spinning, creating a vortex.
Imagine water 'turning' ('whirl') in a 'small body' ('pool') — that's what a whirlpool is, a spinning motion in water.
No commonly confused words.