diver

(vər)

noun

one that dives; specif.,
  1. a person who works or explores underwater, usually breathing air supplied through a special mask or helmet
  2. any of several diving water birds, esp. a loon

See diver in American Heritage Dictionary 4

noun
  1. One that dives: a high diver who excelled in performing the jackknife.
  2. One that works under water, especially one equipped with breathing apparatus and weighted clothing.
  3. Any of several diving water birds, especially the loon.

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