Mammoth Uncensored Word List:
20 - 12 letter words starting with gi

gibberellins giftednesses giftwrapping gigantically giganticides giganticness gigantomachy gilliflowers gillravaging gillyflowers gilravitched gilravitches gingerbreads gingerbready gingerliness gingivectomy gingivitides gingivitises girdlescones girdlesteads