Mammoth Uncensored Word List:
15 words that are 27 letters long in the mammoth uncensored word list.

chemolithoheterotrophically electroencephalographically ethylenediaminetetraacetate honorificabilitudinitatibus microspectrophotometrically octillionduotrigintillionth quinquagintaducentilliardth quinquagintaducentillionths quinquagintatrecentilliards quinquagintatrecentillionth quinquaquadragintilliardths quinquaquinquagintilliardth quinquaquinquagintillionths quinquaseptuagintilliardths ultramicrospectrophotometer