Pacific Ocean pa·ci·fi·cocean uncommon noun 1. the largest ocean in the world SynonymsPacificPacific Ocean Related words Broader terms ocean Narrower terms North PacificSouth Pacific Part of Guadalupe IslandAleutian IslandsOceaniaAustralasiaAustronesiaWake IslandMalay ArchipelagoNew Guinea WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.