admiral; flag officer
A general term for high-ranking naval officers of admiral rank, including rear admiral, vice admiral, and admiral. Used in military contexts.
He was promoted to flag officer.
提督 is a more specific term often used historically or for a fleet commander, while 海軍将官 is a broader category for all admiral ranks.
Compound of 海軍 (navy) and 将官 (general officer), referring to flag officers in a navy.