Here's an example of how "poured" is used as a verb:
* She poured a glass of milk.
Here, "poured" is the action that the subject ("she") performs.
If you're looking for a noun related to the act of pouring, you might use words like:
* pouring (as in, "the pouring of the concrete was a messy affair")
* pour (as in, "she gave a generous pour")
* flow (as in, "the flow of water from the faucet was strong")
* outpouring (as in, "an outpouring of grief")
Let me know if you have other words you'd like to know the grammatical function of!