degenerescence
indivisibility
odontonosology
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Defencelessness
The answer is not the obvious "e" the word Vowel in it self is "vowel" being 6th, so it is the letter a.
Stretch is a 7 letter word with e as the only vowel. Twelfth is another 7 letter words containing only one vowel.
How about "shrewdly" (if you don't count the y as a vowel)?
Rhythm = contains six letters and the only vowel in this word is the "y".