We don't have synonyms for water dragon yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are water wagon and water drain.
(n) :
Any of various agamid lizards of eastern Asia and Australasia, including the genera Physignathus, Intellagama, and Tropicagama, all of subfamily Amphibolurinae.
(n) :
Any of various agamid lizards of eastern Asia and Australasia, including the genera Physignathus, Intellagama, and Tropicagama, all of subfamily Amphibolurinae.