#electron__negatron  an elementary particle with negative charge
  supertype:  lepton  an elementary particle that participates in weak interactions; has a baryon number of 0
  subtype:  delta_ray__deltaray  an electron ejected from matter by ionizing radiation
  subtype:  free_electron  electron that is not attached to an atom or ion or molecule but is free to move under the influence of an electric field
  subtype:  photoelectron  an electron that is emitted from an atom or molecule by an incident photon
  subtype:  valence_electron__valenceelectron  an electron in the outer shell of an atom which can combine with other atoms to form molecules

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