Mammoth Uncensored Word List:
109 words ending with er, 14 letters long

absorptiometer airconditioner antifilibuster autobiographer biosynthesizer bloodthirstier braunschweiger cathodographer chimneysweeper cloakanddagger complementiser complementizer conceptualiser conceptualizer concertmeister counterplotter counterpuncher dactylographer daguerreotyper decommissioner demisemiquaver demythologiser demythologizer diffractometer domesticworker draughtproofer epigrammatiser epigrammatizer geothermometer gewurztraminer grammaticaster gyrostabiliser gyrostabilizer haemacytometer haemocytometer heresiographer heterotetramer huntergatherer individualiser individualizer interferometer intervalometer kindergartener macroassembler metallographer micromanometer micropublisher micropyrometer millivoltmeter misinterpreter misrepresenter multicharacter multiparameter nonfirefighter nonhouseholder nonmountaineer nonphilosopher nonsporeformer nonsympathiser nonsympathizer nonsynthesizer northeasterner northwesterner ophthalmometer oversubscriber particulariser particularizer philosophaster platitudiniser platitudinizer postmultiplier praiseworthier preconditioner pressurecooker prosopographer psychoanalyser psychoanalyzer pyrophotometer radiotelemeter remanufacturer revolutioniser revolutionizer rheogoniometer rhyparographer roentgenometer schlockmeister scintillometer scratchbuilder scratchproofer shatterproofer shillyshallier snippersnapper southeasterner southwesterner spectaclemaker spectrographer steganographer strabismometer syphilographer telephotometer teletypewriter transmogrifier troubleshooter ultracondenser underperformer verticillaster vexillographer weatherproofer whippersnapper