The underworld or netherworld is an otherworld thought to be deep underground or beneath the surface of the world in most religions and mythologies. Typically it is a place where the souls of the departed go, an afterlife or a realm of the dead. Chthonic is the technical adjective for things of the underworld.
近义、反义、联想词
近义词
n.
class, social class, socio-economic class, imaginary place, mythical place, fictitious place