This document discusses the different ways that adjectives can be used as nouns in the English language. It provides 3 main categories: 1) As plural nouns denoting classes of people, 2) As singular nouns denoting abstract qualities, and 3) Some adjectives that have become nouns used in both singular and plural forms, including those derived from proper nouns and denoting persons, things, or specific phrases. Examples are given for each category to illustrate how adjectives can take the role of nouns in sentences.