使い, 遣い: envoy, messenger, ambassador

使い: -er; -ist; -ator; -mancer (user; manipulator; tamer)

使い魔: a familiar

item with utility / (usually prefixed as おつかいもの) present

errand

器械: a device, an appliance, a mechanism / 機械: a machine, equipment, an apparatus / 器械: a utensil, a tool, an instrument / 器械: a tool for conducting a test or experiment or for measurement

messenger

(mythology, folklore, fantasy) a familiar spirit

using; usage; use; utilization / (folklore, fantasy) a charmer / a user / an envoy; a messenger

machine translation