admiral

noun

1. A naval officer of the highest rank; the commander of a country's naval forces.
2. A naval officer of high rank, immediately below Admiral of the Fleet; the commander of a fleet or squadron.
3. A flag officer in the United States Navy or Coast Guard of a grade superior to vice admiral and junior to admiral of the fleet (when that grade is used). An admiral is equal in grade or rank to a four-star general.
4. The ship which carries the admiral, the flagship; also, the most considerable ship of a fleet.