Multiple choice general knowledge The longest word in English that contains only vowels EUOUEA EUNOIA EUOUAE EOUAUE Reveal answer Fill a bubble to check yourself C Correct answer Explanation EUOUAE is the longest word in English containing only vowels. It is a musical term from Gregorian chant representing a sequence of vowels. EUNOIA (beautiful thinking) has 6 letters, while EUOUAE has 7 letters, making EUOUAE the correct answer.