When element of force and violence is used by unlawful assembly then this offence will be called

This question defines a specific criminal act involving a group. Rioting is the correct answer because, under legal definitions such as those in the Pakistan Penal Code (P.P.C.), when an unlawful assembly (a group of five or more people with a common illegal objective) uses force or violence in pursuit of that objective, every member of that assembly is guilty of the offence of rioting. This precisely describes the scenario.

• Assault typically refers to an act that causes another person to apprehend immediate and unlawful personal violence, not necessarily involving an unlawful assembly.
• Felony is a broad category of serious crimes, not a specific offence describing the collective use of force by an unlawful assembly.

Thus, 'Rioting' is the precise legal term for this collective violent act.