1. a distinct group or community that exists within a larger society or culture
2. an underground or hidden realm or environment
Usage: often in fantasy or science fiction contexts

Examples

• The gaming subworld has its own language and customs.
• She discovered a fascinating subworld of street artists in the city.
• The novel describes a mysterious subworld beneath the earth’s surface.
• Each profession creates its own subworld with unique practices.
• The underground tunnels formed a hidden subworld.
• He was drawn into the subworld of competitive chess players.