Mammoth Uncensored Word List:
84 words ending with ts, 16 letters long

acknowledgements agriculturalists antiabortionists anticipointments anticlericalists anticolonialists antiferromagnets antimaterialists antinationalists antirationalists assimilationists biophysiologists biotechnologists chemoattractants chemotaxonomists chronobiologists colonizationists confessionalists conservationists constructionists conventionalists counterarguments counterclaimants counterirritants countermovements cryptozoologists daguerreotypists disafforestments disentanglements disillusionments eclaircissements emancipationists endocrinologists enfranchisements ethnomycologists experimentalists flibbertigibbets geochronologists geomorphologists governmentalists hydrodynamicists hyperexcitements instrumentalists insurrectionists intellectualists interventionists micromanagements milliequivalents multilateralists nonmicroscopists nonpsychiatrists numismatologists ophthalmologists overachievements overdevelopments palaeoecologists palaeontologists paleogeneticists paleopedologists phenomenologists photojournalists physiotherapists preannouncements preferentialists preformationists preservationists pseudoscientists psychobiologists psychophysicists psychotherapists quarterfinalists readvertisements reapportionments reestablishments resurrectionists roentgenologists sedimentologists superbureaucrats supergovernments supernaturalists superspecialists underemployments underinvestments whatchamacallits