Is the word said a noun?

No, "said" is not a noun. It's a verb, specifically the past tense of the verb "say".

Here's why:

* Verbs express actions or states of being. "Said" describes an action (the act of speaking).

* Nouns name people, places, things, or ideas. "Said" doesn't name anything.

If you want to use "said" as a noun, you might use the phrase "the said", which means "the previously mentioned". For example, "The said agreement was signed by both parties."