Mammoth Uncensored Word List:
27 words ending with de, 14 letters long

chlorothiazide chlorpropamide endoradiosonde fibrinopeptide furfuraldehyde glutaraldehyde glyceraldehyde glycolaldehyde interelectrode microelectrode mononucleotide monosaccharide multielectrode phosphopeptide photoelectrode platinocyanide polyacrylamide polynucleotide polysaccharide ribonucleoside ribonucleotide sesquisulphide sulfantimonide sulphacetamide sulphanilamide trichomonacide verisimilitude