We don't have synonyms for peraea yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are persea, penaea and perea.
(n) :
Alternative form of Perea. [(historical) A portion of biblical king Herod's kingdom, on the eastern side of the Jordan River valley, from about one third the way down from the Sea of Galilee to about one third the way down the eastern shore of the Dead Sea.]
(n) :
Alternative form of Perea. [(historical) A portion of biblical king Herod's kingdom, on the eastern side of the Jordan River valley, from about one third the way down from the Sea of Galilee to about one third the way down the eastern shore of the Dead Sea.]