Functionary and Handler

noun

• A worker who holds or is invested with an office.
  • synonyms: official

(n.) One charged with the performance of a function or office; as, a public functionary; secular functionaries.

noun

• One who trains or exhibits animals.
  • synonyms: animal trainer
• An agent who handles something or someone.
  • usage: "the senator's campaign handlers"
• Sports) someone in charge of training an athlete or a team. (.
  • synonyms: coach, manager