We don't have synonyms for wahter yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are water, waiter and waster.
(n) :
Eye dialect spelling of water. [(uncountable) An inorganic compound (of molecular formula H₂O) found at room temperature and pressure as a clear liquid; it is present naturally as rain, and found in rivers, lakes and seas; its solid form is ice and its gaseous form is steam.]
(n) :
Eye dialect spelling of water. [(uncountable) An inorganic compound (of molecular formula H₂O) found at room temperature and pressure as a clear liquid; it is present naturally as rain, and found in rivers, lakes and seas; its solid form is ice and its gaseous form is steam.]