Mammoth Uncensored Word List:
33 - 12 letter words starting with gu

guanethidine guaranteeing guardianship guavaberries gubernacular gubernaculum gubernations guerillaisms guerrillaism guerrilleros guesstimated guesstimates guestimating guilefulness guillotiners guillotining guiltinesses guitarfishes gullableness gumptionless gunfightings gunslingings gunsmithings gurgitations gutterbloods guttersnipes gutterspouts gutturalised gutturalises gutturalisms gutturalized gutturalizes gutturalness