vowel mutation

14 LETTERS · STARTS WITH V

vowel mutation is a valid 14-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

V4O1W4E1L1M3U1T1A1T1I1O1N1

4 + 1 + 4 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does vowel mutation mean?