This document defines and describes different types of nouns in English. It begins by defining a noun as a word used as the name of a person, place, thing, or idea. It then discusses the main types of nouns including proper nouns, common nouns, countable/uncountable nouns, collective nouns, abstract nouns, gerunds, and predicate nouns. It provides examples for each noun type and discusses rules for correct noun usage including formation of plural nouns and possessive nouns. The document serves as a comprehensive reference on nouns in the English language.