The best replacement for agent is manager.

The best alternatives to agent are rated as following:
★★★★★  manager
★★★★★  broker
★★★★  principal
★★  employee
★★  distributor
★★  special agent
★★  independent contractor
★  promoter
★  cpa
★  agentless
★  agency
★  publicist
★  representative
★  real estate broker
★  host
★  online booking
★  principal accounting
★  contractor
  realtor
  subject
  broker insurance
  sellers agent
  self publish
  officer
  reseller
  bounty hunter
  publisher
  friend 2k14
  hesh
  manager music
  smuggler
  intermediary
  pebble
  editor first
  manager acting
  broker real estate
  insurance broker
  stakeholder
  principal ifrs
  assassin
  selling agent
  patent attorney
  for sale by owner
  fsbo
  online
  agent
  subcontractor
  attorney-in-fact
  do it yourself
  fiduciary
  book online
  reagent
  sales representative
  stakeholder deposit
  trustee
  principal revenue recognition
  captive agent

Your alternative for agent is not listed? Suggest!
Speaking about agent, one probably shouldn't forget about passive voice.

Other search terms related to agent and their ratings are:
★★★★★ passive voice
★★★★ broker
★★ passive
★★ acting experience
You have in mind a companion for agent and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of agent in all years. Click on graph for more.
agent
manager
broker