This document discusses the different types of nouns, including:
1) Common nouns and proper nouns, where common nouns name any type of noun and proper nouns name a specific person, place or thing.
2) Abstract nouns and concrete nouns, where abstract nouns are things you cannot see, hear, feel, touch, smell or taste, and concrete nouns are things you can experience with your senses.
3) Mass nouns and count nouns, where mass nouns cannot be counted and have no plural form, and count nouns can be counted and can be singular or plural.