World War and Cold War are two different types of conflicts in world history. The main differences are:

1. Timeframe: The World War happened between 1939-1945, while the Cold War spanned from the late 1940s to the early 1990s.

2. Nature of the conflict: The World War was an open military conflict that involved the use of guns, bombs, tanks, and other weapons. The Cold War, on the other hand, was a political and ideological struggle between the Western democracies led by the United States and the Communist nations led by the Soviet Union. It was fought through proxy wars, espionage, and propaganda.

3. Participants: The World War involved most of the major powers of the world, including the Axis powers of Germany, Japan, and Italy, and the Allied powers of the United States, Great Britain, and the Soviet Union. In contrast, the Cold War was primarily fought between the United States and the Soviet Union, although other countries aligned with one or the other in their ideological positions.

4. Casualties: The World War resulted in over 75 million casualties, including both military and civilian deaths. The Cold War, although there were some casualties, did not result in a direct military conflict between the two superpowers, thus the number of casualties were minimal.

5. Outcome: The World War ended with the defeat of the Axis powers and the establishment of the United Nations. The Cold War ended with the collapse of the Soviet Union and the triumph of Western democracy.