The List
There are 69 6 letter words with U as the last letter. The highest scoring is QUIPPU at 19 points in Scrabble. 59 carry three or more vowels, which makes them useful for dumping a vowel-clogged rack.
ABATTUACAJOUALLYOUAMADOUAPERCUBATEAUBHIKHUBINIOUBOUBOUBUREAUCACHOUCADEAUCALALUCONGOUCOTEAUCOYPOUDETENUEPERDUGAGAKUGATEAUGOMOKUGRUGRUHALERUHAPUKUINGENUJABIRUKARAMUKERERUKIKUYUKOKOPUKOTUKULANDAUMADAFUMAHEWUMAKUTUMALIBUMAMAKUMANATUMANITUMATATUMEVROUMILIEUMUUMUUMZUNGUNHANDUNILGAUNOGAKUORIHOUORMOLUPILLAUPISTOUPIUPIUQUIPPURAWARURESEAUROUCOUSADDHUSAMSHUSENRYUSHINJUSHITZUSUBFEUTAMANUTAUHOUTELEDUUBUNTUVOUDOUWHANAUYNAMBU