THESAURUS
bathymetric, bathyorographical, deep-sea, hydrographic, marine, maritime, nautical, naval, navigational, ocean-going, oceanic, oceanographic, salty, seafaring, seamanlike, seamanly, terriginous, thalassic, water-borne
ROGET THESAURUS
Ocean
N
sea, ocean, main, deep, brine, salt water, waves, billows, high seas, offing, great waters, watery waste, vasty deep, wave, tide, hydrography, hydrographer, Neptune, Poseidon, Thetis, Triton, Naiad, Nereid, sea nymph, Siren, trident, dolphin, oceanic, marine, maritime,
pelagic, pelagian, seagoing, hydrographic, bathybic, cotidal, at sea, on sea, afloat.