Does a concrete noun have to be something you can touch?

That's a great question! While most concrete nouns refer to things you can touch, it's not a hard and fast rule. Here's why:

* Physical vs. Conceptual: Concrete nouns represent something that exists physically in the world, but that doesn't always mean you can touch it.

* Example: You can't touch the "wind" or "rain," but they are concrete because they are physical phenomena.

* Abstractions can be concrete: Some abstract concepts can be considered concrete if they have a tangible manifestation.

* Example: "Freedom" is an abstract concept, but a "flag" representing freedom is a concrete noun.

So, the key is whether the noun represents something that exists in the physical world, not necessarily something you can touch.

Let me know if you'd like to explore more examples!