world-famous
world-wide-web
No, it's just "champion".
It is not hyphenated.
No it's not hyphenated.
Motorcycle is not hyphenated
No. You would have to be the leader of the world to do that.
words are only hyphenated when they have a separate meaning when separated than they do when hyphenated
No, "hardworking" is not hyphenated.
Yes it should be hyphenated.
It can be. Some words can be seen both hyphenated and non-hyphenated.
Yes it should be hyphenated.