on or onto a ship, aircraft, or other vehicle

जहाज पर

English Usage: The passengers went aboard the cruise ship.

Hindi Usage: यात्रियों ने क्रूज जहाज पर चढ़ाई की।

on board (a vehicle or vessel)

बोर पर

English Usage: We were all aboard the plane when it took off.

Hindi Usage: जब विमान ने उड़ान भरी, हम सभी बोर पर थे।