The scientific name iouea, 5 letters, is a genus of Cretaceous fossil sponges and is the shortest word.
Eunoia, six letters long, is the shortest word in the English language that contains all five main vowels.
Seven letter words include adoulie, douleia, eucosia, eulogia, eunomia, eutopia, miaoued, moineau, sequoia, and suoidea.