What is a group of Hornets called?

A group of hornets is commonly called a Nest. Other collective nouns you may see include Swarm and Buzz.

A collective noun for hornets is a swarm. Swarms are used to describe groups of social insects like hornets, which typically congregate together. In the case of hornets, swarms are known for their highly organized behavior and group dynamics. These buzzing creatures have developed a complex caste system within their colony, with various roles such as queens, workers, and drones. The swarm, functioning as a unified entity, displays tremendous coordination and cooperation for the survival and growth of the hornet colony. They actively build intricate nests in trees, shrubs, or even in human-made structures. A hornet swarm is a striking spectacle, possessing both a formidable presence and an efficient mechanism for defense against potential threats. Furthermore, if provoked or sensing danger, a swarm of hornets may release pheromones as a distress signal, mobilizing all members within the colony to defend their territory together. This united front also enables hornets to effectively hunt and capture prey, contributing to the overall benefit of the collective and ensuring the long-term success of their species.