oxidation pond vs waterworks

oxidation pond and waterworks both are nouns.

Word	Noun	Adjective	Verb	Adverb
oxidation pond	Yes	No	No	No
waterworks	Yes	No	No	No

As nouns, waterworks is a hypernym of oxidation pond; that is, waterworks is a word with a broader meaning than oxidation pond:

oxidation pond: large, shallow ponds designed to treat wastewater through the interaction of sunlight, bacteria, and algae
waterworks: workplace where water is stored and purified and distributed for a community

oxidation pond (noun)	waterworks (noun)
large, shallow ponds designed to treat wastewater through the interaction of sunlight, bacteria, and algae	workplace where water is stored and purified and distributed for a community
	a public utility that provides water