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The word which has all the vowels "AUTOMOBILE". There is A,E,I,O,U
autau
Dialogue uses all five vowels. Additional words include equation, euphoria, auctioned, authorize, behavior, cautioned, dialogues, education, equations, housemaid, inoculate, jailhouse, outgained, pneumonia and tenacious.
That is a trick question. You can't make a four letter word using all five vowels.
A word that uses all 5 vowels in order is "facetious".