Mammoth Uncensored Word List:
49 words ending with gy, 13 letters long

accidentology actinobiology aerolithology anthropophagy archaezoology archeozoology bacteriophagy biochronology biophysiology biopsychology biotechnology chronobiology cosmeticology cryptozoology cytopathology diplomatology dysmorphology ecophysiology ecotoxicology endocrinology epizootiology ethnomycology genethlialogy geochronology geomorphology geotechnology helminthology neuroethology neurotheology nonnephrology numismatology ophthalmology palaeobiology palaeoecology palaeontology palaeozoology paleopedology paleovirology phenomenology psychobiology roentgenology sedimentology splanchnology stoicheiology synchronology systematology thremmatology zoophysiology zoopsychology