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.
The second instance when you should capitalize the word “world” is when the word is used as a part of a proper noun.
Should I capitalize the word World?
“World” should be capitalized when: It is the first word in a sentence; for example, “‘World’ should be capitalized when it is the first word in a sentence.” It is part of a proper name; for example, “World War II,” “World of Warcraft.”
Should the earth be capitalized?
In English, proper nouns (nouns which signify a particular person, place, or thing) are capitalized. Following this rule, when Earth is discussed as a specific planet or celestial body, it is capitalized: It takes six to eight months to travel from Earth to Mars. When Earth is a proper noun, the is usually omitted.
Which words should be capitalized?
Use capitals for proper nouns. In other words, capitalize the names of people, specific places, and things. For example: We don’t capitalize the word “bridge” unless it starts a sentence, but we must capitalize Brooklyn Bridge because it is the name of a specific bridge.
Is the word world a proper noun?
Therefore it is considered a common noun and not capitalized. Compare with Earth (the planet, not the soil found on its surface). Since this names one of many planets, it is a proper noun and really ought to be capitalized, although it often isn’t.