The shortest, 6 letter word that contains all vowels is EUNOIA, meaning alertness of mind. However, many dictionaries rejected this word to be an English word.
If we ignore above word, next word that contains all vowels with length=7 are br>:SEQUOIA
:EULOGIA
:MIAOUED
:ADOULIE
:EUDOSIA
:EUNOMIA
:EUTOPIA
:MOINEAU
:DOULEIA.