A scar is a mark on your skin that shows where it has healed after it was damaged. Scar tissue can also form inside you if you have an internal injury. The man in the picture has a scar from donating a kidney.
A scarab is a type of beetle with a hard, shiny shell and strong legs built for digging. Many scarabs live in warmer, drier climates. Some species bury dung or roll it into balls, while others feed on leaves, roots, or decaying plants. Scarabs are known for their tough bodies and their useful habit of moving things around in the ground.
You scare someone when you make them scared or frightened.
The man in the picture is trying to scare his cat.
A scarecrow is a human-shaped device that people put near crops to scare off birds. The idea is that the birds think the scarecrow is a real person and will stay away from it.
