We don't have synonyms for raggle yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are gaggle, waggle and haggle.
(n) :
(construction) A groove or slot, often cut in a masonry wall or other vertical surface, for inserting an inset flashing component such as a reglet.
(n) :
(construction) A groove or slot, often cut in a masonry wall or other vertical surface, for inserting an inset flashing component such as a reglet.