Word classes (parts of speech) were described by Sanskrit grammarians from at least the 5th century BC. In Yāska's Nirukta, the noun (nāma) is one of the four main categories of words defined.
The 展开

• The cat sat on the chair.
• Please hand in your assignments by the end of the week.
• Cleanliness is next to godliness.
• Plato was an influential philosopher in ancient Greece. 展开

A noun phrase (or NP) is a phrase usually headed by a common noun, a proper noun, or a pronoun. The head may be the only constituent, or it may … 展开

Pronouns
Nouns and noun phrases can typically be replaced by pronouns, such as he, it, she, they, which, these, and … 展开

Nouns have sometimes been characterized in terms of the grammatical categories by which they may be varied (for example gender, case, and number). Such definitions tend to be … 展开

Nouns can have a number of different properties and are often sub-categorized based on various of these criteria, depending on their occurrence in a language. Nouns may be classified according to morphological properties such as which 展开

• Description
• Grammatical case
• Phi features
• Punctuation
• Reference 展开