What is the difference between "Bobsled" and "Bobsleigh"? Can they be used interchangeably? Which one is used more widely?
According to Cambridge Advanced Learner's Dictionary and Oxford Advanced Learner's Dictionary, bobsled is used more often in North American English, bobsleigh is used more often in British English. There is no difference between them.
On the NOAD, it gives Bobsled as the main term and Bobsleigh as "another term", like a synonym, but then there is only a Wikipedia article about Bobsleigh, not Bobsled (although they are both mentioned in the article).
Anyway, on the OALD, it says Bobsleigh is the British term, while Bobsled is North American.
So, depending on the context you can use either.