bathymetry vs plumbing

bathymetry and plumbing both are nouns.

Word	Noun	Adjective	Verb	Adverb
bathymetry	Yes	No	No	No
plumbing	Yes	No	No	No

As nouns, bathymetry and plumbing are synonyms defined as:

bathymetry (noun)	plumbing (noun)
measuring the depths of the oceans	measuring the depths of the oceans
	the occupation of a plumber (installing and repairing pipes and fixtures for water or gas or sewage in a building)
	utility consisting of the pipes and fixtures for the distribution of water or gas in a building and for the disposal of sewage