Noun: Names a person, place, thing, or an idea.
Common Noun: Names any one of a group of persons, places, things, or ideas. Ex. Woman
Proper Noun: Names a particular person, place, thing, or idea. Ex. Alice Walker
Concrete Noun: Names a person, place, or thing that can be perceived by one or more of the senses. Ex. Tree
Abstract Noun: Names an idea, feeling, quality, or a characteristic. Ex. Confusion