What is a collective nouns that starts with Y?

There aren't many collective nouns starting with Y. Here's one possibility:

* Yolk (referring to a group of eggs)

While not commonly used, it could be argued that "yolk" can function as a collective noun, similar to "clutch" or "nest" when referring to a group of eggs.

Let me know if you'd like to explore other options or have a different type of noun in mind!