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29 words ending with er, 14 letters long

antifilibuster autobiographer braunschweiger complementizer conceptualizer concertmeister counterpuncher demisemiquaver demythologizer diffractometer epigrammatizer gewurztraminer gyrostabilizer interferometer intervalometer kindergartener metallographer micropublisher multicharacter multiparameter nonphilosopher remanufacturer revolutionizer schlockmeister scintillometer snippersnapper teletypewriter troubleshooter whippersnapper