diver

Short definition from Wiktionary

Noun

1. 1
   Someone who dives, especially as a sport.
2. 2
   Someone who works underwater; a frogman.
3. 3
   loon (Gavia)
4. 4
   The New Zealand sand diver.
5. 5
   The long-finned sand diver.
6. 6
   A passenger carrying vehicle using an underground route; specially, a diver tram, one using the former Kingsway tramway subway (1906-1952).
7. 7
   pickpocket
8. 8
   A competitor in certain sports who is known to regularly imitate being fouled, with the purpose of getting his/her opponent penalised.