Mammoth Uncensored Word List:
82 words ending with r, 15 letters long

anteroposterior astrophotometer autotransformer cardioinhibitor cerebrovascular chromatographer chronobarometer cigaretteholder cinematographer circumambulator circumnavigator contrapropeller copyrightholder counterattacker counterreformer crossclassifier crosspollinator crossquestioner diastereoisomer electrocutioner electroreceptor extracurricular extrafollicular extraglomerular historiographer immunomodulator interclavicular interfascicular intertentacular intracerebellar intrafascicular intraglomerular juxtaglomerular katathermometer kinematographer malpractitioner mechanoreceptor microcontroller microphotometer microprogrammer misunderstander mountainboarder musculocellular nonmanufacturer nonphotographer overneutralizer paroemiographer periventricular phacoemulsifier pharyngobasilar photomultiplier photosensitiser photosensitizer phototransistor phototypesetter phytogeographer pontocerebellar posteroanterior premanufacturer prestidigitator radiogoniometer radiomicrometer radiosensitizer singlepropeller skeletomuscular spinocerebellar stretcherbearer stylomandibular subcommissioner subintelligitur subquadrangular supersensitiser supraclavicular telethermometer thalassographer thermobarometer thermoregulator transmissometer ultramarathoner ultramicrometer vasoconstrictor weatherstripper