Mammoth Uncensored Word List:
42 - 14 letter words starting with fe

fearlessnesses fearsomenesses feasiblenesses featherbedding featherbrained featherinesses featherweights fecklessnesses federalisation federalization feeblemindedly feldspathoidal felicitousness fellmongerings fellowshipping femininenesses femtobecquerel femtochemistry fermentability fermentatively fermentescible ferricyanogens ferrimagnetism ferrimyoglobin ferrochromiums ferroconcretes ferrocyanogens ferroelectrics ferromagnesian ferromagnetism ferromanganese ferropericlase ferroprussiate fertilisations fertilizations fetishisations fetishizations feudalisations feudalizations feuilletonisms feuilletonists feverishnesses