What is a word for a large group of people gathered together?

The word "throng" refers to a large group of people gathered closely together, often in a busy or crowded context. It conveys the idea of a multitude, emphasizing the size and density of the gathering. This term is commonly used to describe chaotic or bustling scenes where many individuals congregate, such as at events, rallies, or markets.

The other choices do not fit this description. "Solitude" refers to the state of being alone, which is the opposite of a gathering. "Gaggle" typically describes a group of geese or can refer to a disorganized group of people, but it is not as widely used in a formal sense to denote a large crowd compared to "throng." "Entity" is a term that refers to something that exists as a distinct and independent unit, which does not inherently suggest a group of people. Thus, "throng" is the most suitable word for a large assembly of individuals.