A dense crowd is a term that refers to a highly populated group of people who are gathered closely together. Sometimes, a dense crowd can become overwhelming, as it may be difficult to navigate through. Some synonyms for a dense crowd could include a throng, a swarm, or a crush. Each of these terms evokes a sense of a tightly packed group of people. A throng suggests a bustling, busy group, while a swarm indicates a mass of people moving in unison. A crush, on the other hand, implies a more chaotic gathering of people. Overall, synonyms for a dense crowd help to convey the feeling of a large, crowded gathering.