Here's what rhymes with monohydrate.

Consider these alternatives

dihydrate / hydrate perchloric / historic isopropanol / whole forsterite / feet crystallizes / enterprises hydrochloride / chloride hydroxide / dioxide trihydrate / hydrate homoserine / seen pyrophosphate / phosphate glucuronide / side borate / late dextroamphetamine / ketamine trifluoroacetic / magnetic phosphonate / late acetic / magnetic rutin / including tretinoin / join tyramine / nine carbonate / late pantothenic / academic guanidine / seen maleate / faleate lactulose / close sorbic / aortic isotretinoin / join precipitates / cipitates hydronium / chromium