Senior naval rank (4-7)

(Other definitions for admiral that I've seen before include "Eg, Nelson" , "Navy chief" , "Brightly coloured butterfly" , "High-ranking naval officer like Nelson" , "Blake, for one" .)

(Other definitions for commodore that I've seen before include "Naval officer" , "President of a yacht club" , "Naval rank junior to rear-admiral" , "senior officer" , "officer, surely?" .)