#neutron_star__neutronstar  a star that has collapsed under its own gravity; it is composed of neutrons
  supertype:  star  (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior
  subtype:  pulsar  a degenerate neutron star; small and extremely dense; rotates very fast and emits regular pulses of polarized radiation

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