Mammoth Uncensored Word List:
37 - 16 letter words starting with ex

exaggerativeness exceptionability exceptionalities excommunications excruciatingness exemplifications exhaustibilities exhaustivenesses existentialistic experimentalisms experimentalists experimentations exploitabilities expressionlessly expressivenesses extemporaneities extemporaneously extemporisations extemporizations extensionalities exteriorizations externalisations externalizations exterritoriality extrachromosomal extracorporeally extracorpuscular extractabilities extracurriculars extrahepatically extraneousnesses extraparenchymal extrapericardiac extrapericardial extraterrestrial extraterritorial extraventricular