We don't have synonyms for porche yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are porch, perche and porsche.
°A covered and enclosedentrance to a building, whether taken from the interior, and forming a sort of vestibule within the main wall, or projecting without and with a separate roof.
°A covered and enclosedentrance to a building, whether taken from the interior, and forming a sort of vestibule within the main wall, or projecting without and with a separate roof.