socio-economic class vs underworld

Other hyponyms of socio-economic class include domain, world, age class, agriculture, brotherhood, fraternity, sodality, estate, estate of the realm, the three estates, labor, labour, proletariat, working class, lower class, underclass, bourgeoisie, middle class, booboisie, commonality, commonalty, commons, peasantry, demimonde, yeomanry, caste, caste, upper class, upper crust, ninja, firing line, immigrant class, center, centre, old school, market, craft, trade, fair sex, woman, womanhood, patriciate.