We don't have synonyms for flaske yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are flask, flake and laske.
(n) :
Obsolete form of flask. [A narrow-necked vessel of metal or glass, used for various purposes; as of sheet metal, to carry gunpowder in; or of wrought iron, to contain quicksilver; or of glass, to heat water in, etc.]
(n) :
Obsolete form of flask. [A narrow-necked vessel of metal or glass, used for various purposes; as of sheet metal, to carry gunpowder in; or of wrought iron, to contain quicksilver; or of glass, to heat water in, etc.]