Penteconter is a type of ancient Greek ship that was used for warfare and transportation purposes. It was a relatively small vessel, with only 50 oarsmen, and it was often used in naval battles. Synonyms for the word Penteconter include galley, trireme, and bireme. The galley is a type of ship that was also used in ancient times, particularly by the Romans and Greeks. It was similar in size to the Penteconter but had more oarsmen. The trireme was a type of ancient Greek warship that was larger than the Penteconter and had three banks of oars. The bireme was a smaller version of the trireme that had two banks of oars.