white blood cells are a kind of cell
lymphocyte is white_blood_cell. leukocyte is white_blood_cell. red_blood_cell is blood_cell. white_blood_cell is not blood_cell. white_blood_cell is anatomical_structure. phagocyte is white_blood_cell. white_blood_cell is not anatomical_structure. white_blood_cell is blood_cell. leukocyte is not white_blood_cell.