Understanding the rules of capitalization can be challenging since the rules depend on the context of the sentence. The word “world” is no exception.
In general, the word “world” is lowercase except in three instances. The first instance of when “world” should be capitalized is when used as the first word in a sentence. For example, “World is a proper noun.”
The second instance when you should capitalize the word “world” is when the word is used as a part of a proper noun. For example, “World War II”. This is mainly because “world” in this scenario is a proper noun just like Jupiter, Pluto, or the Pacific Ocean.
The final instance when the word “world” is capitalized is when used in a title. Be it that of an article, a book, or any other written text. An example of such a case is a movie titled “Christopher Columbus Circumvents the World”.