Mammoth Uncensored Word List:
23 words ending with i, 12 letters long

apparatchiki caravansarai caravanserai chiquichiqui contrabbassi cumulostrati divertimenti electrophori fractocumuli fractostrati gastrocnemii ichthyosauri interstimuli kinetonuclei lactobacilli leptocephali meningococci opisthodomoi paleotsunami putangitangi stratocumuli streptococci zinjanthropi