- sewage, sewerage - waste matter carried away in sewers or drains
--1 is a kind of waste, waste material, waste matter, waste product; biodegradable pollution
--1 has substances: effluent, wastewater, sewer water - sewer, sewerage, cloaca - a waste pipe that carries away sewage or surface water
--2 is a kind of drain, drainpipe, waste pipe
--2 is a part of sewage system, sewer system, sewage works