Mammoth Uncensored Word List:
47 words ending with y, 20 letters long

abdominohysterectomy adrenoleukodystrophy antiinsurrectionally arthroophthalmopathy autolithographically autoradiographically biostratigraphically chemoautotrophically chemotherapeutically cholecystnephrostomy counterrevolutionary crystallographically electrohydraulically episioperineorrhaphy ethnomusicologically existentialistically histomorphologically hydrometallurgically immunocytochemically immunohistochemistry indistinguishability microphotometrically neurophysiologically neuropsychiatrically noninterdisciplinary nonstereoselectively nonstereospecificity nontrigonometrically overenthusiastically overrepresentatively pathophysiologically pharmacoepidemiology photoautotrophically phytophysiologically plethysmographically pseudoasymmetrically pseudoscientifically psychopathologically radiotelegraphically roentgenographically salpingooophorectomy stereophotogrammetry syncategorematically ultramicroscopically uncharacteristically ureterosigmoidostomy vaginoperineorrhaphy