The term 'blood bank supply' refers to the materials used to store and transport blood and its components. PLASMA, which is the liquid component of blood, is a six-letter word. Sera, which is a type of SERUM containing antibodies, is a four-letter word. PLASMAS, which are the proteins found in blood, is a seven-letter word. Lastly, SERUM, which is the clear liquid that separates from clotted blood, is a five-letter word.