Plump means a little fat, but in a good way.
People often describe baby animals as plump.
Something is poisonous if it contains poison. Poison can make you very sick, or kill you. Poison needs to get inside you somehow to be dangerous. Poisonous mushrooms and berries are usually eaten, and poisonous insects and snakes inject poison when they bite you. The frog in the picture will poison anything that eats it, and people use the poison from the frog to put on arrows and darts to help them hunt.
Someone is poor if they do not have much money. An area might be described as poor if it is run down and a lot of poor people live there.
You also use poor to describe something you feel sorry for. For example, if you see a hurt bird you might say "oh, look at the poor bird".
Pis forPrefabricated
Prefabricated describes something that has been made for quick assembly or construction. Prefabricated homes are often called mobile homes because they can be transported whole, unlike normal homes which can't be moved.
You feel proud when you have a good feeling about something that you have done, or something that someone else has done. A parent may be proud of their child who has just graduated university. A child may be proud of making a very good painting.
The boy in the picture is proud of his newborn baby brother.