A photocopier is a device that makes copies of flat images, like the pages from a book. Photocopiers used to only be able to make black and white copies but today many photocopiers can make color copies too.
A printer is a device that you connect to a computer. Printers turn files that you can only see on the computer's screen into printed images on a piece of paper.
A protractor is a device used for measuring angles. You can get protractors as both half and full circles. Protractors are also useful for drawing angles.
A stamp is a small piece of paper that is worth money. You use stamps to pay to have letters and parcels posted. Every country has their own different stamps, and lots of different designs and pictures on all their different stamp denominations.