The right hand side of a ship, when stood looking towards the
bow is starboard.
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The ends of a ship are fore (the front) and aft (the rear), the
sides of a ship are port (the left-hand side of a ship as one faces
forward) and starboard (the right-hand side of a ship as one faces
forward)
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If you actually mean, what is the left hand side of the ship called... It is the port side. It has mostly the same things as the right side of the ship (called the starboard).
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As you stand on a ship and face the prow, the left hand side is
called Port and the right hand side is called Starboard.
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When you stand on the ship and face the bow, the right-hand side
is "starboard". The left-hand side is "port".