WordNet (r) 3.0 (2006):

sulfonate
    n 1: a salt of sulphonic acid

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "sulfonate":
   acetify, acidify, acidulate, alkalify, alkalize, borate, carbonate,
   catalyze, chemical, chlorinate, electrolyze, ferment,
   homopolymerize, hydrate, hydrogenate, hydroxylate, isomerize,
   nitrate, oxidize, pepsinate, peroxidize, phosphatize, polymerize,
   reduce, sulfate, sulfatize, work