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A proper noun is a noun that identifies a single entity and is used to refer to that entity (Africa; Jupiter; Sarah; Walmart) 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).
A proper noun (sometimes called a proper name, though the two terms normally have different meanings) is a noun that represents a unique entity (India, Pegasus, Jupiter, Confucius, Pequod) – as distinguished from common nouns (or appellative nouns), which describe a class of entities (country, animal, planet, person, ship). [11]
Thus, Zealand, for example, is a proper noun, but New Zealand, though a proper name, is not a proper noun. [4] Unlike some common nouns, proper nouns do not typically show number contrast in English. Most proper nouns in English are singular and lack a plural form, though some may instead be plural and lack a singular form.
A proper article indicates that its noun is proper, and refers to a unique entity. It may be the name of a person, the name of a place, the name of a planet, etc. The Māori language has the proper article a, which is used for personal nouns; so, "a Pita" means "Peter".
The meaning of the noun used for a common name may have been lost or forgotten (whelk, elm, lion, shark, pig) but when the common name is extended to two or more words much more is conveyed about the organism's use, appearance or other special properties (sting ray, poison apple, giant stinking hogweed, hammerhead shark).
Nouns are also created by converting verbs and adjectives, as with the words talk and reading (a boring talk, the assigned reading). Nouns are sometimes classified semantically (by their meanings) as proper and common nouns (Cyrus, China vs frog, milk) or as concrete and abstract nouns (book, laptop vs embarrassment, prejudice). [4]
Like common nouns that are derived or associated with proper names (a few are mentioned above), adjectives, verbs, and adverbs derived from proper names are not themselves proper names, but they are normally still capitalized in English (though not in many other languages): Dickensian and Balkan (adjectives), Balkanize (verb), Trumpishly (adverb).
For example, NN for singular common nouns, NNS for plural common nouns, NP for singular proper nouns (see the POS tags used in the Brown Corpus). Other tagging systems use a smaller number of tags and ignore fine differences or model them as features somewhat independent from part-of-speech. [2]