Nouns: Denotes a person, place, or thing. Nouns act as a subject of a complete sentence or objects of a verb. Nouns are able to be divided into the subcategories of proper/common nouns, compound nouns, countable/uncountable nouns, and regular/irregular plural nouns.
Proper nouns: These are particular individuals, places, and things which are always capitalized within sentences. Some examples of these include: names of cities, countries, languages, and religions.
Common nouns: These are nouns which are not proper and also not capitalized within a sentence. They refer to general objects such as: "language", "country", "day", "city" (notice it is not the names of them).
Compound nouns: Theses are two or more nouns combined together. Some include: "backpack", "drawbridge", "firefly", and "bathroom".
Countable nouns: These are that can be expressed in both a singular and plural form. Some examples include: "chairs", "books", "women", "people", and "trees".
Uncountable nouns: These are nouns which do not have a plural form. Instead, the singular form is used for both the singular and plural form. Examples of this are: "music", "furniture", "fish", and "sheep".