We don't have synonyms for solubilities yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are solubilizes, solubilises and insolubilities.
(n) :
(chemistry) The amount of a substance that will dissolve in a given amount of a solvent, to give a saturated solution, under specified conditions.
(n) :
(chemistry) The amount of a substance that will dissolve in a given amount of a solvent, to give a saturated solution, under specified conditions.