#bitumen  any of various naturally occurring impure mixtures of hydrocarbons
  supertype:  hydrocarbon  an organic compound containing only carbon and hydrogen
  subtype:  tar  any of various dark heavy viscid substances obtained as a residue
     subtype:  coal_tar  a tar formed from distillation of bituminous coal; coal tar can be further distilled to give various aromatic compounds

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