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galley 
Warship with a sail and oars that was used in ancient times; it disappeared in the 18th century.
oar
Long piece of wood that is broad and flat at one end; it is mounted on the boat and pulled by one or more people to propel the boat.
ram
Timber jutting out in front of the prow usually at water level; it was used to punch holes in the hulls of enemy ships.
