* Common noun: When referring to a group of students, "class" is a common noun. It's a general name for a group of people sharing similar characteristics, like grade level or subject.
* Example: "The class was excited for the field trip."
* Abstract noun: When "class" refers to a social rank, category, or level of quality, it's an abstract noun. It represents an idea or concept that cannot be physically touched.
* Example: "She belongs to the upper class."
Therefore, the type of noun "class" is depends on the context in which it is used.