Mammoth Uncensored Word List:
30 words ending with or, 14 letters long

astronavigator benzoxycamphor bronchodilator circumferentor coinvestigator decontaminator denitrificator differentiator disarticulator excommunicator interconnector microprocessor microprojector multiconductor multiprocessor noncontributor nuclearreactor photoconductor photoinitiator predistributor pressoreceptor procrastinator prognosticator retroreflector sacroposterior superconductor thermoreceptor transliterator turbogenerator vicechancellor