We don't have synonyms for hadler yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are handler, hauler and haler.
°One who handles something (especially manually) or someone.
"''The handler of a weapon gets a symbolic sensation of deadly power."
°(in combination) A controller, trainer, someone who handles a specified thing, animal or person (especially a prizefighter), which can be specified in a combination.
"''The spy's handler told him to approach the subject by posing as a dog handler."
°One who handles something (especially manually) or someone.
"''The handler of a weapon gets a symbolic sensation of deadly power."
°(in combination) A controller, trainer, someone who handles a specified thing, animal or person (especially a prizefighter), which can be specified in a combination.
"''The spy's handler told him to approach the subject by posing as a dog handler."