Printed, grrr has no vowel. In this word, the / r / has a flow of air that makes it continuous, unlike a stopped consonant, like /p, t, k, b, d, g/. Think of the word father , just continuing the second syllable.
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AnonymousI believe an English word needs aAll you need is a continuant, a sound that can be continued, especially a voiced one. This includes many sounds besides just vowels, and it excludes plosives like p, t, and k.verbvowel? to come up with a sound like "baa."