An epenthetic vowel is a vowel sound that is inserted into a word to make it easier to pronounce. Examples of epenthetic vowels include the "uh" sound in "uh-oh" and the "uh" sound in "lawyer." Synonyms for the term "epenthetic vowel" include intrusive vowel, excrescent vowel, and prosthetic vowel. An intrusive vowel is a vowel that can be added between two consonants to make a word easier to pronounce. An excrescent vowel is a vowel that is added to the end of a word to make it easier to pronounce. A prosthetic vowel is a vowel sound that is added at the beginning of a word to make it easier to pronounce.