game 和 competition 和 match 和 contest 和 tournament 有什么区别？如果难以说明的话，请教我一下例句。

I'd say its a really thin line for the meanings of these words as they're all very similar. It depends on the sport/event. For tournaments, I would say there are many matches within a tournament, sort of like a bracket (College basketball for example) For competition, I would say it could be at any level, whether it's a friend against a friend or a team against a team. For match and game, they're pretty much the same, just different uses depending on the sport. Basketball game, football game, hockey game. Vs. Wrestling match, Boxing match, etc.