sewage works vs sewage system

sewage works and sewage system both are nouns.

Word	Noun	Adjective	Verb	Adverb
sewage works	Yes	No	No	No
sewage system	Yes	No	No	No

As nouns, sewage works and sewage system are synonyms defined as:

sewage works and sewage system: facility consisting of a system of sewers for carrying off liquid and solid sewage

Other synonyms of sewage works include sewer system.

sewage works (noun)	sewage system (noun)
facility consisting of a system of sewers for carrying off liquid and solid sewage	facility consisting of a system of sewers for carrying off liquid and solid sewage