According to a Mexican friend of mine, murciélago (bat) is the only Spanish word with all five vowels.
In English, we have facetiously, which has all 5½ vowels (y is the half) in alphabetical order. I also like the words vacuum and aardvark for the unusual double vowels.
The coolest French word may be jouaient (third person plural imperfect of jouer – to play), which has all five vowels in a row!
And créée (feminine past participle of créer – to create) with its triple E.
Any other vowel-laden words?