Mammoth Uncensored Word List:
29 words ending with de, 13 letters long

acetazolamide antipesticide butyraldehyde chlorobromide consimilitude cyanogenamide cycloheximide dissimilitude hydrochloride hydrofluoride hydroperoxide hydrosulphide monoglyceride nonlanthanide overmultitude protochloride radionucleide schadenfreude semicarbazide shoulderblade sulfacetamide sulfanilamide sulfochloride tetrachloride tetrafluoride thiocarbamide transactinide trinucleotide trisaccharide