Difference between son and fool in Korean
아들·바보

아들son
The word "아들" means "son," or a male child in a family. You use it when talking about your own son or someone else’s son in everyday life. It is a common family word and often appears when introducing family members.

바보fool
바보 means “fool” or “silly person.” People use it when someone does something careless, funny, or not smart. Friends or family may say it playfully, but it can sound rude if you say it seriously.
The difference
아들 means a son in the family. It is a family role, while 바보 is a label you can say about anyone and it can sound rude.