General meaning:
* Classe: This is the most common word and can be used in most situations, referring to a group of people or things sharing similar characteristics, such as a social class, a class in school, or a class of products.
Other meanings:
* Cours: This refers specifically to a class in school or a course of study.
* Catégorie: This word means "category" and can be used to refer to a specific class of something, such as a class of animals or a class of wine.
* Rang: This word means "rank" and can be used to refer to a social class or level of importance.
Examples:
* La classe moyenne: The middle class.
* Un cours de français: A French class.
* Une catégorie de produits: A category of products.
* Le rang de la noblesse: The rank of nobility.
Choosing the correct word will depend on the specific meaning you are trying to convey.