Synonyms for Plumbing (same or very similar meaning)
WordNet sense 1 (utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewage):
plumbing systemWordNet sense 2 (measuring the depths of the oceans):
bathymetryWordNet sense 3 (the occupation of a plumber (installing and repairing pipes and fixtures for water or gas or sewage in a building)):
plumberyFrom the ODE community, based on WordNetadd/edit