Before revision: Epenthesis: The addition of one or more sounds to a word, especially to the interior of a word (at the beginning prothesis and at the end paragoge are commonly used).
After revision: Cacoepy, the opposite of orthoepyEpenthesis: The addition of one or more sounds to a word, especially to the interior of a word (at the beginning prothesis and at the end paragoge are commonly used).