Nouns are words that name people, places, things, ideas, or qualities. There are several types of nouns including common nouns, proper nouns, collective nouns, abstract nouns, and material nouns. Nouns can also be categorized as countable or uncountable based on whether they can be counted or not. Countable nouns have both singular and plural forms. Nouns also have gender which can be masculine, feminine, or common.