Mammoth Uncensored Word List:
34 words ending with ds, 14 letters long

allopolyploids antiapartheids autopolyploids cercopithecids chateaubriands clinopinacoids clinopinakoids companionhoods counterdemands diprotodontids ducentilliards duodecilliards gentlemanhoods hexactinellids hydromedusoids isocarboxazids kinetoplastids macropinakoids miscomprehends misunderstands mountainboards neighbourhoods noncontrabands northeastwards northwestwards orthopinakoids particleboards southeastwards southwestwards thenceforwards tredecilliards ultrawidebands unthriftyheads vigintilliards