Onlookerses are individuals who observe or watch a particular event or situation unfold. In order to vary your language and express the same idea using different words, there are several synonyms to utilize. One possible option is spectators, which suggests people who are watching a performance or sporting event. Another synonym is bystanders, which implies people who are near the scene of an event but are not directly involved. Another term to use is observers, which suggests a more scientific or objective perspective. In a similar vein, witnesses may also work, implying people who can provide firsthand testimony to an event. Finally, gawkers may be used, although this term can suggest a more negative or critical tone.