What is another word for "dolphin"?

Roget's Thesaurus (1911) lists these synonyms for "dolphin": afloat, brine, cotidal, deep, great, high, hydrographer, hydrographic, hydrography, main, marine, maritime, motion, nymph, ocean, oceanic, offing, pelagian, pelagic, salt, sea, seagoing, tide, trident, vasty, waste, water, watery, wave.