13-letter words starting with na
- nautical mile — a unit of distance used chiefly in navigation, equal to 6080.20 feet (1853.25 meters) in the U.S., now replaced by the international nautical mile.
- naval academy — a collegiate institution for training naval officers.
- naval college — training institution for the navy
- naval officer — member of navy staff
- navigableness — Quality of being navigable.
- navy register — (in the US) an annual publication giving genealogical information about the commissioned and warrant officers in the US Navy.