What do you call someone who collects collective nouns?

There isn't a specific word for someone who collects collective nouns. It's an unusual collecting niche!

Here are some playful options you could use:

* Collective Noun Connoisseur

* Group Gatherer

* Noun Nester

* Phraseophile (This is a general term for someone who loves phrases, but it could encompass collecting collective nouns)

Ultimately, the best way to describe someone who collects collective nouns depends on the context and the tone you want to convey.