We don't have synonyms for praefect yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are prefect, praelect and prelect.
(n) :
Alternative form of prefect (Ancient Roman official) [(historical) An official of Ancient Rome who controlled or superintended a particular command, charge, department, etc.]
(n) :
Alternative form of prefect (Ancient Roman official) [(historical) An official of Ancient Rome who controlled or superintended a particular command, charge, department, etc.]