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It is like spoon and shovel. Taekwondo and Kung Fu might be the same like a cat and a lion is the same. It might be like a pond and an ocean. Better yet, it might be like the difference between a cat and a dog. I could tell you that I have two pets. I have two animals. You could say, "No, you have one dog and one cat because a dog is not a cat and cat is not a dog." Yes, Taekwondo is not karate and karate is not Taekwondo. But there are clearly differences between defining terms specifically and generically. For example, I could get mad, specifically, if you were to say, "Handsome man in Seattle." But generically speaking, I could be not mad. Because I am specifically not in Seattle. But generically speaking, "IN SEATTLE" does not mean actually in Seattle but perhaps near Seattle or in the Seattle area as I do in fact live outside of Seattle and in the general area. Likewise, Taekwondo might live in the general area outside of karate or vice versa.

Dear Arnold, I'm South Korean, so I don't know much about American culture so you understand.
If you're unpleasant by the nickname of a handsome man in Seattle, what can I call you?

Normally, Americans made their nicknames good.

I am happy with your nickname.

I'm glad you feel that way. hahaha