Synonyms of oceanic

2 Syllables
coastal, yachting, naval, seagoing, shorer
3 Syllables
littoral, nautical, seaside, seafaring, amphibious, thalassic, aquatic, oceangoing, sailorly, sea-loving, pelagic, ocean-going, saltwater, neptunian
4 Syllables
natatory, maritime, natatorial, hydrographic
5 Syllables
navigational, oceanographic