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Exactly my commonsense reaction. One is product, other is process.
Another word I have trouble with is "electrical" when "electric" does just fine as an adjective. If we save a couple of letters, it should save space, ink, paper, trees, thought, energy, and maybe lots more. Electric is greener than electrical.
"The term sewage is nowadays regarded as an older term and is being more and more replaced by "wastewater".[2] In general American English usage, the terms "sewage" and "sewerage" mean the same thing.[3][4][5] In common British usage, and in American technical and professional English usage, "sewerage" refers to the infrastructure that conveys sewage.[6]