pipework vs sewer

pipework

• Any system of pipes or tubes; piping 

• The pipes and stops of an organ 

sewer

• A pipe or system of pipes used to remove human waste and to provide drainage. 

• One who sews. 

• A small tortricid moth, the larva of which sews together the edges of a leaf using silk. 

• A servant attending at a meal who is responsible for seating arrangements, serving dishes, etc. 

• To provide (a place) with a system of sewers.