The concept of a "hierarchy of hell" refers to the idea that there are varying levels of punishment and torment in the afterlife for different sins. There are several synonyms that can be used to describe this idea, including "infernal pecking order," "underworld hierarchy," and "demonic ranking system." Other possible synonyms include "devilish hierarchy," "satanic order," and "depths of damnation." These terms all convey the idea of a structured system of punishment in the underworld, with different levels of horror depending on the severity of one's sins. Ultimately, the concept of a "hierarchy of hell" speaks to humanity's fears of divine punishment and eternal damnation.