What is a noun for content?

There isn't one single perfect noun for "content" as it depends on the specific context. Here are some options, along with examples of how they'd be used:

General:

* Material: "The website's material is very informative."

* Information: "The book contains valuable information."

* Data: "The research team collected a lot of data."

* Substance: "The lecture lacked substance."

* Matter: "This is a matter of great importance."

Specific types of content:

* Text: "The website has a lot of interesting text."

* Video: "The YouTube channel features high-quality video."

* Audio: "The podcast offers insightful audio content."

* Image: "The article includes a stunning image."

* Article: "The magazine published a thought-provoking article."

* Post: "The blog post was widely shared."

More abstract:

* Message: "The speaker's message was clear and concise."

* Idea: "The author presented some interesting ideas."

* Concept: "The lecture explored the concept of time."

The best choice depends on the specific situation and the type of content you're referring to.