'topside' definitions:

Definition of 'topside'

noun

(usually plural) weather deck; the part of a ship's hull that is above the waterline

Synonyms of 'topside'

From: Moby Thesaurus

aboard,
afloat,
all aboard,
aloft,
at the head,
at the top,
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

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