Mammoth Uncensored Word List:
96 words ending with ls, 13 letters long

agrichemicals agrochemicals anticlericals anticolonials antimalarials antiparallels apfelstrudels aquaceuticals bicentennials bimillennials brachycephals chlorambucils confessionals contrasexuals conventionals counterspells dentilinguals deuteranomals differentials difunctionals dunniewassals etonogestrels euroterminals exabecquerels extracranials extragonadals fluorouracils forestaysails glockenspiels hemorrhoidals heterodactyls heterosexuals hexobarbitals hydrothermals hyperarousals hypotheticals instrumentals intellectuals interglacials interspersals interstadials interstitials invitationals isocheimenals mangelwurzels methylphenols microcrystals misappraisals multichannels nanomaterials nonessentials nonnumericals nonsteroidals nonuniversals pentadecimals phenylmethyls phosphatidyls planetesimals preceptorials presbyterials procathedrals processionals professionals proportionals pseudofossils pumpernickels pyrocatechols quadrinomials quarterfinals quasicrystals quinquennials responsorials schismaticals secobarbitals servocontrols sprachgefuhls steeringsails stigmasterols stilboestrols studdingsails subcelestials subfactorials subprincipals superfrontals superhumerals supernaturals superspecials supplementals swimmingpools tetradecimals thiodiglycols transitionals ultraliberals ultraradicals whippoorwills wineglassfuls