IPA: /ˈdraʊnər/
KK: /ˈdraʊnər/
A person who is in the process of drowning or has drowned.
The lifeguard quickly jumped into the water to save the drowner.
Drowner → The word is formed from "drown" (from Old English "drūgan", meaning to submerge or suffocate) and the suffix "-er" (meaning a person who). A drowner is a person who causes someone or something to be submerged or to suffocate in water.
Think of someone who 'submerges' ('drown') another person — that's why a drowner is someone who causes drowning.