WordNet (r) 3.0 (2006):

photon
    n 1: a quantum of electromagnetic radiation; an elementary
         particle that is its own antiparticle

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "photon":
   ASA scale, British candle, Hefner candle, Kern, NMR,
   Scheiner scale, X ray, actinic ray, actinism, alpha particle,
   antibaryon, antilepton, antimeson, atomerg, atomic beam,
   atomic nucleus, atomic particle, atomic ray, baryon, beam,
   beam of light, beta particle, bougie decimale, calorie, candle,
   candle lumen, candle power, candle-foot, candle-hour, candle-meter,
   decimal candle, dinamode, dyne, electron, elementary particle,
   energid, erg, exposure meter, flux, foot-candle, foot-pound,
   gamma ray, gleam, horsepower-hour, horsepower-year, infrared ray,
   intensity, international candle, invisible radiation, joule,
   kilogram-meter, kilowatt-hour, lamp-hour, leam, lepton, light,
   light meter, light quantum, lumen, lumen meter, lumen-hour,
   lumeter, luminous flux, luminous intensity, luminous power, lux,
   meson, neutron, nuclear force, nuclear magnetic resonance,
   nuclear particle, nuclear resonance, nucleon, nucleosynthesis,
   nucleus, patch, pencil, proton, quantum, radiation, radiorays, ray,
   ray of light, ribbon, ribbon of light, solar rays, strangeness,
   streak, stream, stream of light, streamer, strong interaction,
   triton, ultraviolet ray, unit of flux, unit of light,
   valence electron, violet ray



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PHOTON
       paneuropean PHOtonic Transport Overlay Network (ACTS)