ABOIDEAU
ABOITEAU
AUREOLAE
EPOPOEIA
EULOGIAE
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1. LONGEST WORD CONTAINING ALL SIX VOWELS.
is ANTISTREPHORRHYNCHUS (an extinct crustacean) [Susan Thorpe]. Other long words are HYDROMETALLURGISTS and NONUNDERSTANDINGLY [Stuart Kidd].
).
2. The longest words containing the six vowels in alphabetical order, each occurring only once, are ABSTENTIOUSLY and MARVEILLOUSLY (variant of marvellously).
ANOTHER, the longest words containing the six vowels in alphabetical order are PANCREATICODUODENOSTOMY and PANCREATICODUODENECTOMY (in the Merriam-Webster Medical Dictionary
3. longest and shortest words that have each vowel exactly twice
ULTRAREVOLUTIONARIES has each vowel exactly twice.
and the longest, USSOLZEWIECHINOGAMMARUS (a small crustacean) [Susan Thorpe].
The shortest such word is CUBOIDEONAVICULARE (Ligamentum cuboideonaviculare),
PSEUDOPSEUDOHYPOPARATHYROIDISM (which is in OED2) has each vowel at least twice.
4. four long words (about 6-9 letters each) containing only one CONSONANT?
OUENOUAOU (a stream in the Philippines) has vowels for 8 of its 9 letters and may be the longest place name with one consonant.
PUNAAUIA (a village in Tahiti) has vowels for 6 of its 8 letters [Juozas Rimas].
OUABAIO (an African tree) has vowels for 6 of its 7 letters [Stuart Kidd].
OGOOUE (an African river) has vowels for 5 of its 6 letters.
5. longest common words without A, E, I, O, U
RHYTHMS, but these additional words appear in W2: SYMPHYSY, NYMPHLY, GYPSYRY, GYPSYFY.
The OED2 has TWYNDYLLYNG(S).
And WPPWRMWSTE (in the OED) goes nine letters without an A, E, I, O, or U;
GLYCYRRHIZIN (a constituent of licorice) goes eight letters without A, E, I, O, or U. (In all these words, "Y" is a vowel.)
6. The longest word in dictionaries having only one vowel is STRENGTHS