sewer / suer are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
sewer: (noun) a waste pipe that carries away sewage or surface water. (noun) someone who sews.
suer: (noun) someone who petitions a court for redress of a grievance or recovery of a right.
sewer: s·UW·er
suer: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)