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From the official Scrabble dictionary:AllhealBellhopFulhamsKolhozyOilholeWoolhat
Iouea, a genus of sea sponges, contains all five regular vowels and no other letters
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Uranus
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There are no common English words spelled with only those letters, other than the pronoun I and the slang word yuk.
The words unicorn and onion have the letters o, n, and i in common. Other than that, unicorns and onions have remarkably little in common. One is a mythological animal, and the other is a real vegetable.