What is the collective noun for red hair?

Answer 1

There is no collective noun specifically for 'red hair', however the collective nouns for hair are a lock of hair and a tuft of hair.

Collective nouns are an informal part of language, Any noun that suits a situation can function as a collective noun. You can use a noun that suits your fancy, such as a head of red hair, a blaze of red hair, an inferno of red hair, etc.