Assistant, Atom, Attendant, Attorney, Author, Auxiliary, Barrister, Base, Beginner, Biochemical, Broker, Buyer, Candidate, Catalyst, Cation, Cause, Channel, Chemical, Clerk, Commissionaire, Commissioner, Compound, Conductor, Connection, Consignee, Contrivance, Counsel, Creator, Creature, Delegate, Deputy, Device, Dimer, Director, Distributor, Doer, Driver, Dummy, Dupe, Effector, Element, Emissary, Engineer, Envoy, Executive, Executor, Fabricator, Factor, Father, Fed, Force, Front, Functionary, Generator, Governor, Handler, Handmaiden, Help, Helper, Helpmate, Implement, Impresario, Ingredient, Instigator, Instrument, Instrumentality, Instrumentation, Sire, Slave, Solicitor, Spokesman, Spokesperson, Spokeswoman, Spook, Spy, Steward, Stooge, Subject, Substitute, Surrogate, Tie, Tool, Toy, Vehicle, Wholesaler, Worker, Federal, Acid, Acidity, Acolyte, Activator, Actor, Adjutant, Administrator, Advocate, Agency, Aid, Aide, Aider, Alkali, Alkalinity, Amanuensis, Anion, Antacid, Appliance, Appointee, Architect, Intermediary, Intermediate, Interventionist, Ion, Isomer, Lawyer, Legate, Lever, Liaison, Licensee, Lieutenant, Link, Maker, Manager, Manipulator, Means, Mechanism, Mediator, Medium, Middleman, Midwife, Minion, Minister, Ministry, Molecule, Monomer, Mother, Mouthpiece, Mover, Negotiator, Nominee, Official, Ombudsman, Operative, Operator, Organ, Originator, Parent, Pawn, Performer, Perpetrator, Pilot, Plaything, Polymer, Power, Practitioner, Proctor, Producer, Proxy, Puppet, Radical, Reagent, Rector, Representative, Runner, Second, Secretary, Selectee, Servant