The term ‘world’ can be both a common noun and a proper noun, depending on how it is used in a sentence. When we refer to ‘the world’ in a general sense, such as discussing the Earth or human existence as a whole, it is considered a common noun. For example, in the sentence ‘The world is a beautiful place,’ the word ‘world’ does not denote a specific entity but rather a general concept.
However, ‘World’ can also be used as a proper noun when it is part of a proper name or title, such as in ‘World War II’ or ‘World Health Organization.’ In these instances, it is capitalized because it refers to a specific event or organization. Therefore, whether ‘world’ is a proper noun or not completely depends on its usage in context.