This document defines and provides examples of different types of nouns:
1) It describes common nouns which name general people, places or things, and proper nouns which name specific people, places or things.
2) It explains concrete nouns which refer to things we can experience with our senses, and abstract nouns which refer to ideas and qualities we cannot directly experience.
3) It provides rules for making nouns singular or plural and gives examples of irregular plural nouns.