sewer system vs sewage works

sewer system and sewage works both are nouns.

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

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

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

Other synonyms of sewer system include sewage system.

sewer 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