Dopamine. I'm sure that there are others but I can't think of them at the moment.
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The ten-letter word for letters that are not vowels is consonants.
Rocking is a word with 7 letters 5 consonants and 2 vowels
Oakley's
A word with 4 vowels and 6 consonants would have a total of 10 letters. One example of such a word could be "education." This word has the vowels e, u, a, and i, and the consonants d, c, t, n, and, and has a total of 10 letters.
There are 4 vowels and 7 consonants in this word. So, 4/11 of the letters are vowels.