What is a group of Onlookers called?

A group of onlookers is commonly called a Crowd. Other collective nouns you may see include Cry and Chatter.

Collective nouns are terms used to describe groups of people or things. When it comes to onlookers - individuals observing a particular event or situation - there isn't a specific collective noun exclusive to them. However, several existing group terms can be improvised or used metaphorically to refer to onlookers collectively. One possible collective noun for onlookers is a "gaze." Similar to how a group of birds is called a flock, a group of onlookers can analogously be referred to as a "gaze" due to their shared act of observing attentively. This term conjures an image of a crowd standing together, all their faces intently fixed on the object of intrigue. Another collective noun that could apply is "spectacle." Often used to describe an impressive or remarkable sight, it can also represent a group of onlookers gathered around a captivating event. Firstly, it brilliantly captures the essence of the situation - that a sight worth witnessing has brought people together. Additionally, it serves as a way to encapsulate both the active viewers and the event being watched within a single term. Furthermore, "spectators" is a commonly understood collective noun for onlookers, referring to a group observing a specific event or performance. Originating from its Latin root "spectare," meaning "to observe," this term emphasizes that the individuals within the group are willingly and actively engaged in watching. In the absence of a precise collective noun, these aforementioned conceptual adaptations provide imaginative options to describe onlookers as a cohesive group. They convey the shared experience and unity in observation, making the language more colorful while capturing the essence of their actions.