sewage system vs sewage works

sewage system and sewage works both are nouns.

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

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

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

Other synonyms of sewage system include sewer system.

sewage system (noun)	sewage works (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