Demiworld refers to a shadowy, half-real place, and there are several synonyms for this word. One synonym could be "underworld," which refers to the realm of the dead or the criminal underworld. Another synonym could be "limbo," which is a place of uncertainty and waiting. Similar words in meaning could include "twilight," which refers to the transition between day and night, or "netherworld," a place of darkness and shadows. Other synonyms could include "subterranean," "foggy," "ethereal," or "nebulous." Regardless of the word used, each synonym helps to describe a place that is mysterious, uncertain, and often misunderstood.