Short answers, pulled from the story.
A noun is a word that represents a concrete or abstract thing, including living creatures, places, actions, events, qualities, states of existence, and ideas. Nouns can function as the subject or object within a phrase, clause, or sentence. They are defined both by their semantic properties and by how they combine with other lexical categories such as articles and adjectives.
The English word noun derives from the Latin term nomen, passing through the Anglo-Norman form nom before reaching its modern spelling. The Latin nomen, the Ancient Greek onoma, and the Sanskrit nama all shared the double meaning of both noun and name, reflecting how early grammarians understood the category as fundamentally about naming.
Count nouns such as chair, nose, and occasion can take a plural form, combine with numerals, and appear after the indefinite article a or an. Mass nouns such as furniture cannot be pluralized or combined with number words in standard use. Many English nouns, like soda, function as count nouns in some contexts and mass nouns in others.
A proper noun names a unique entity, such as India, Pegasus, Jupiter, Confucius, or Pequod, and is capitalized in Modern English regardless of its position in a sentence. A common noun names a class of entities, such as country, animal, planet, person, or ship. Derived forms of proper nouns, like Albanian and Newtonian, are also capitalized, though some derivatives such as pasteurized have lost that capitalization through widespread use.
Sanskrit grammarians described word classes including the noun from at least the 5th century BC. The noun nama appears as one of four main categories in Yaska's Nirukta. The Ancient Greek equivalent onoma was discussed by Plato in the Cratylus and later listed as one of eight parts of speech in The Art of Grammar, attributed to Dionysius Thrax in the 2nd century BC.
Collective nouns such as committee, government, and police are singular in form but refer to groups of more than one individual. In English they may be followed by a singular or plural verb; the singular is generally preferred when treating the group as a unit, while the plural is preferred, especially in British English, when emphasizing the individual members.