noun

• Someone who dives, especially as a sport.
• Someone who works underwater; a frogman.
• (UK, Ireland) loon (bird)
• The New Zealand sand diver.
• The long-finned sand diver.
• (UK, London, dated) A passenger carrying vehicle using an underground route; specially, a diver tram, one using the former Kingsway tramway subway (1906-1952).
• (slang, obsolete) pickpocket
• (sports) A competitor in certain sports who is known to regularly imitate being fouled, with the purpose of getting his/her opponent penalised.