What is the collective noun for vowels?

Answer 1

There is no collective name for vowels.

However, the word 'vowels' is a collective sttement for thre five letters of the English alphabet, which are' a,e,i,o,u.'

Answer 2

There is no specific collective noun for the noun vowels, in which case a noun suitable for the situation can be use, for example a group of vowels, a string of vowels, a bunch of vowels, etc.