What is a group of Topics called?

A group of topics is commonly called an Agenda. Other collective nouns you may see include Branch and Range.

Collective nouns refer to a group of entities or individuals that are presented as a single unit or entity. They are commonly used in the English language to describe various groups of objects, animals, or people. Collective nouns give specific names to these groups, making communication more precise and efficient. Collective nouns for topics are specifically used to describe groups or categories related to a particular subject or discipline. These nouns help categorize and classify ideas, concepts, or themes under a common umbrella, facilitating discussions and organization of information. For example, in the field of science, collective nouns such as "branch," "field," or "realm" are used to describe groups of related topics. You might often hear sentences like, "The branches of biology encompass topics like botany, zoology, and genetics", providing a concise way to classify various topics within the broader domain of biology. In literature or academic discourse, you might encounter collective nouns like "genre," "subgenre," or "category," which are used to group related topics in fictional or scholarly contexts. For instance, someone would refer to the genre of mystery novels, which encompasses subgenres like detective fiction, crime thrillers, or suspenseful mysteries. Collective nouns for topics help us organize and classify information, making it easier to discuss, study, or delve deeper into a specific subject. They provide a framework within which we can explore interconnected ideas and create a more comprehensive understanding of a particular field. Whether in conversation, research, or educational settings, collective nouns for topics enable clear and effective communication around specific areas of interest.