We don't have synonyms for directer yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are direct, director and directly.
(n) :
Archaic form of director. [One who directs; the person in charge of managing a department or directorate (e.g., director of engineering), project, or production (as in a show or film, e.g., film director).]
(n) :
Archaic form of director. [One who directs; the person in charge of managing a department or directorate (e.g., director of engineering), project, or production (as in a show or film, e.g., film director).]