The verb pour means to make liquid flow out from a container by inclining the container. When you put milk or juice from the carton into a glass, you are pouring it.
When it's raining very hard, you can also say "It's pouring."
Po or (adjective) is the opposite of rich. If a person is poor, they have little or no money or possessions:
I grew up in a poor family; we couldn't even afford new shoes for school.
The word poor can also be used to describe something that is below average; does not meet satisfactory standards:
These products are of extremely poor quality - they break easily.
Attendance at the seminars was poor; only a dozen people showed up in a room that could seat a hundred.
Finally, poor can also be used to describe somebody who deserves pity:
The poor guy waited at the bus stop for hours in the rain.
You have a sore throat? You poor thing! Let me get you some tea.
(the expression "you poor thing!" expresses pity for a person who is in a bad situation)
A pore (noun) is a very tiny opening in the skin. Sweat comes out of your skin through pores. Some facial cleansing soaps claim to clean out your pores.
We also have the expression to pore over something, meaning to read or study it carefully and attentively:
He pored over the articles as he did research for his paper.
She's looking for a new job; she's been poring over the classified ads in the newspaper every day.