Something is closed if you cannot get into it or through it. The door in the picture is closed. The opposite of closed is open. Another word for closed is shut.
A clot is a soft lump, usually formed in a liquid. When you cut yourself, your blood clots so you stop bleeding. The picture is of clots forming in milk as it curdles.
Cloth, or fabric, is a large, thin material that is made from tiny fibers connected together. Cloth is used to make clothes, drapes, some kinds of bag and many other things besides.
The picture is of some long rolls of cloth.
A clothes hanger, or coathanger, is a triangular object with a hook at the top that you use for hanging your clothes up inside a wardrobe. Coathangers can be made from wire, wood or plastic.
An iron is a device that gets very hot on the flat side underneath it. You rub the flat side on your clothes to remove the wrinkles and make sharp creases.