Difference between stamp and paintbrush in Korean
도장·붓

도장stamp
A 도장 is a stamp that makes a mark on paper. At school, teachers often use it on homework, notebooks, or reward charts. People also use stamps for names, simple approval, or official papers.

붓paintbrush
A 붓 is a paintbrush, the tool you use to put paint on paper or another surface. Students often use it in art class, and people also use it at home to paint pictures. You can talk about a big brush, a small brush, or buying a new one.
The difference
A 붓 is used to paint or write with ink or color by hand. A 도장 makes the same ready-made mark each time when you press it.