This document defines and explains different types of nouns. It begins by defining a noun as a word used to name a person, place, thing, or abstract idea. It then provides examples of different types of nouns, including common and proper nouns, count and non-count nouns, singular and plural nouns, concrete and abstract nouns, compound nouns, and collective nouns. Finally, it discusses possessive nouns, including rules for making nouns possessive and indicating separate or shared possession between two nouns.