What is the term for a writ that instructs a tenant and all persons claiming under the tenant to leave the premises immediately?

The correct answer, which refers to a writ that instructs a tenant and all persons claiming under the tenant to vacate the premises immediately, is the term "Possession." In the context of civil process, a writ of possession specifically authorizes law enforcement to remove individuals from occupied property when a court determines that the landlord is entitled to regain possession.

This writ is often issued after a successful eviction lawsuit when a court has ruled in favor of the landlord. It serves as a formal legal order that empowers the landlord, with the assistance of the police, to take possession of the property without further delay.

While eviction is a general process that can involve various legal steps taken to remove a tenant, "dispossessory" generally refers to a specific type of action or claim to recover premises. Ejectment refers to the legal action itself to remove someone from property but doesn’t specifically denote the writ. Therefore, "Possession" encapsulates the immediate forceful removal of a tenant and any others on the property, as instructed by the court's writ.