RBC also called erythrocyte, WBC also called Leukocytes , Platelets also called thrombocytes, Neutrophils Also called micro policemen of blood, Monocytes also called macro policemen of blood

RBC=Erythrocytes bcoz of their red hollow structure, WBC=Leukocytes bcoz of their white colour , Platelets=Thrombocytes bcoz of their very important secretion Thromboplastin, Neutrophils=Micro policemen bcoz of their small size and phagocytic nature, Monocytes=Macro policemen bcoz of their large size and phagocytic nature, Eosinophils=Acidophils bcoz of their staining with acid dyes like Eosin