Proper noun
GRAMMATICAL CONCEPT
ProperNames; Common noun; Proper names; Proper nouns; Improper noun; Proper name; Common nouns; Proper Noun; Proper name (linguistics); Non-proper noun; Non-proper nouns; Proper noun and common noun; Proper and common noun; Proper versus common noun; Proper versus common nouns; Common and proper nouns; Common and proper noun; Common-noun phrase; Common noun phrase; Proper noun phrase; Proper-noun phrase; Proper and common nouns
A proper noun is a noun that identifies a single entity and is used to refer to that entity (Africa, Jupiter, Sarah, Microsoft) as distinguished from a common noun, which is a noun that refers to a class of entities (continent, planet, person, corporation) and may be used when referring to instances of a specific class (a continent, another planet, these persons, our corporation). Some proper nouns occur in plural form (optionally or exclusively), and then they refer to groups of entities considered as unique (the Hendersons, the Everglades, the Azores, the Pleiades).