French word plombier comes from French -ier, French plomb (Fuse. Lead (metal). Sinker (fishing weight).)

Detailed word origin of plombier

Dictionary entry	Language	Definition
-ier	French (fra)	Used to form the names of jobs. Used to form the names of ships. Used to form the names of trees bearing a particular type of fruit.
plomb	French (fra)	Fuse. Lead (metal). Sinker (fishing weight).
plombier	French (fra)	Plumber (profession).

Words with the same origin as plombier