1. diver, frogman, underwater diver, explorer, adventurer

usage: someone who works underwater

2. diver, plunger, swimmer

usage: someone who dives (into water)

3. loon, diver, gaviiform seabird

usage: large somewhat primitive fish-eating diving bird of the northern hemisphere having webbed feet placed far back; related to the grebes

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See also: diver (Dictionary)