There are 3 in your question!
Stretch is a 7 letter word with e as the only vowel. Twelfth is another 7 letter words containing only one vowel.
Rhythm = contains six letters and the only vowel in this word is the "y".
angst
The word strength has only one vowel.The adopted word from German, schnapps, also has only one vowel.
stretch
stir
Stretch is a 7 letter word with e as the only vowel. Twelfth is another 7 letter words containing only one vowel.
evil
The letter A (the only vowel) has a short A sound.
Rhythm = contains six letters and the only vowel in this word is the "y".
If you are referring to the verb "fish", than one possible option would be Cast.
angst
The word strength has only one vowel.The adopted word from German, schnapps, also has only one vowel.
alumatomexamitem
There is only one vowel (the letter e), in the word wet.
Defencelessness
Strengths