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22 words ending with rs, 16 letters long

autotransformers chromatographers cinematographers circumnavigators counterattackers counterreformers diastereoisomers extracurriculars historiographers immunomodulators malpractitioners mechanoreceptors microphotometers photomultipliers photosensitizers phototypesetters phytogeographers prestidigitators thermoregulators transmissometers ultramarathoners vasoconstrictors