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The Collaborative International Dictionary
Navarch

Navarch \Na"varch\ (n[=a]"v[aum]rk), n. [L. navarchus, Gr. nay`archo`s; nay^s ship + 'archo`s chief.] (Gr. Antiq.) The commander of a fleet.
--Mitford.

Wiktionary
navarch

n. (context historical Ancient Greece English) The commander of a fleet.

Wikipedia
Navarch

Navarch (; pronounced návarchos) is a Greek word meaning "leader of the ships", which in some states became the title of an office equivalent to that of a modern admiral.