#gauge_boson__gaugeboson  a particle that mediates the interaction of two elementary particles
  supertype:  boson  any particle that obeys Bose-Einstein statistics but not the Pauli exclusion principle; all nuclei with an even mass number are bosons
  subtype:  gluon  a gauge boson that mediates strong interaction among quarks
  subtype:  gravitons__graviton  a gauge boson that mediates the (extremely weak) gravitational interactions between particles
  subtype:  intermediate_vector_bosons  a gauge boson that mediates weak interactions between particles
  subtype:  photon  a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle

No statement uses or specializes gauge_boson; click here to add one.