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28 words ending with or, 13 letters long

administrator authenticator chemoreceptor coconspirator conglomerator congratulator counterterror deconstructor defibrillator discriminator disintegrator indoctrinator interbehavior interpellator monochromator noncompetitor noncooperator photodetector photoreceptor predestinator proprioceptor reconstructor rehabilitator reinvigorator semiconductor subcontractor tergiversator transmigrator