What are the six classifications of nouns?

Nouns can be classified as:

- Common nouns or proper nouns

- Singular nouns or plural nouns (collective nouns may be singular or plural)

- Abstract nouns or concrete nouns

- Compound nouns combine two or more nouns (or nouns and adjectives) to create a single term with a specific meaning.

- Possessive nouns (also genitive) act as adjectives to show attributes or ownership (the man's hair, Joe's car)

- Countable or uncountable nouns (mass nouns can also have plural forms)