sodder / solder 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. 👇
sodder: NA
solder: (noun) an alloy (usually of lead and tin) used when melted to join two metal surfaces. (verb) join or fuse with solder.
sodder: NA
solder: s·AA·d·er
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)