Synonyms to at the top

topside, aboard, afloat, all aboard, aloft, at the head, athwart the hawse, athwarthawse, before the mast, clerestory, in sail, on board, on board ship, on deck, on shipboard, on the top, on top, ridgepole, roof, roofpole, rooftop, surface, top, top floor, top side, topsides, upper side, upside