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23 words ending with r, 15 letters long

autotransformer cerebrovascular chromatographer cinematographer circumnavigator counterattacker counterreformer diastereoisomer extracurricular historiographer immunomodulator malpractitioner mechanoreceptor microphotometer photomultiplier photosensitizer phototypesetter phytogeographer prestidigitator thermoregulator transmissometer ultramarathoner vasoconstrictor