What part of speech is a diagram?

"Diagram" can be a few different parts of speech depending on how it's used:

* Noun: This is the most common usage. It refers to a visual representation of information, like a flowchart or a map.

* Example: "The teacher drew a diagram on the board to explain the concept."

* Verb: This is less common, but it means to create a diagram.

* Example: "Let's diagram the sentence to understand its structure."

So, the answer depends on the context!