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21 words ending with ls, 14 letters long

antibacterials antimicrobials biconditionals dinitrophenols infinitesimals internationals isoproterenols multinationals neurochemicals noncommercials nonhomosexuals nonreciprocals pentobarbitals perissodactyls petrochemicals phenobarbitals quadrilaterals supercriminals tablespoonfuls tercentennials tortoiseshells