We don't have synonyms for ephorus yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are ephors and phorus.
(n) :
(historical) Alternative form of ephor. [(historical) One of the five annually-elected senior magistrates in various Dorian states, especially in ancient Sparta, where they oversaw the actions of Spartan kings.]
(n) :
(historical) Alternative form of ephor. [(historical) One of the five annually-elected senior magistrates in various Dorian states, especially in ancient Sparta, where they oversaw the actions of Spartan kings.]