Assertion: proper noun's noun | /r/CapableOf | identify single entity
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text: A proper noun is a noun that identifies a single entity and is used to refer to that entity, such as London, Jupiter, Sarah, or Microsoft, as distinguished from a common noun, which is a noun that refers to a class of entities (city, planet, person, corporation) and may be used when referring to instances of a specific class (a city, another planet, these persons, our corporation).