Overseas rhymes with:
underseas, apc's, c's, cees, foresees, francies, jaycees, lessees, licensees, pc's, pcs, powerpcs, powerpcs', saez, scorsese, sea's, seas, sease, sees, seese, seize, sies, tennessee's, underseas
Overseas sounds like:
o'berg, oberg, oberhaus, oberweis, obverse, offer's, offerers, offers, opera's, operas, oppress, oppresses, oprah's, ovaries, overcash, overcook, overcooks, overhears, overreach, overreaches, overs, oversaw, oversea, oversee, oversees, oversize, oversizes, overuse, overuses, overwork, overworks, oviparous, ovoviviparous