What is the collective noun for studies?

There isn't one commonly accepted collective noun specifically for "studies."

However, you can use more general collective nouns depending on the context, like:

* Body of work: For a collection of academic research or scholarly writings.

* Collection: For a group of studies on a particular topic.

* Series: For a group of studies conducted in sequence.

* Suite: For a group of studies that are designed to work together.

* Research: For a collection of studies that are part of a larger research project.

Ultimately, the best collective noun will depend on the specific context of your writing.