What are the four genders of nouns and pronouns?

There is no system of four genders for nouns and pronouns in any widely spoken language. The most common gender systems are:

* Two-gender systems: These are found in languages like English, Spanish, French, and German. They typically have masculine and feminine genders.

* Three-gender systems: These are found in languages like Latin and Russian. They have masculine, feminine, and neuter genders.

* Genderless systems: These are found in languages like Finnish, Hungarian, and Mandarin Chinese. They do not assign genders to nouns or pronouns.

There is no system that uses four genders. If you are referring to a specific language or context, please provide more information.