#microorganism  any organism (animal or plant) of microscopic size
  supertype:  living_thing__organism__being  a living (or once living) entity that has (or can develop) the ability to act or function independently
  subtype:  intestinal_flora  virus  moneran  bacteria  microbe  pathogen  protoctist  protist
  part:  pilus__pilu  hairlike structure especially on the surface of a cell or microorganism

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