Nouns are words that name people, places, things, and ideas. There are several types of nouns including common nouns, proper nouns, concrete nouns, and abstract nouns. Common nouns refer to general people, places, and things while proper nouns specifically name a particular person, place, or thing. Abstract nouns refer to ideas, qualities, and conditions that cannot be experienced by the physical senses whereas concrete nouns refer to physical objects that can be experienced by senses.