WordNet (r) 3.0 (2006):

press agent
    n 1: someone employed to arrange publicity (for a firm or a
         public figure) [syn: press agent, publicity man,
         public relations man, PR man]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "press agent":
   Federal, advertise, agent, amanuensis, baggage agent, build up,
   business agent, claim agent, clerk, commercial agent,
   commission agent, consignee, cry, customer agent, dupe, factor,
   fed, federal agent, freight agent, functionary, general agent,
   implement, instrument, insurance agent, land agent, law agent,
   literary agent, loan agent, news agent, official,
   parliamentary agent, passenger agent, puff, puppet,
   purchasing agent, real estate agent, sales agent, secretary,
   special agent, station agent, steward, theatrical agent,
   ticket agent, tool, travel agent, walking delegate