Monocytic leukemia is a type of blood cancer that affects the white blood cells responsible for fighting infections. There are several synonyms for monocytic leukemia, including monoblastic leukemia, acute myelomonocytic leukemia (AMML), and myelomonocytic leukemia. Monoblastic leukemia refers specifically to the subtype of monocytic leukemia that mainly affects immature monocytes, while AMML is a more general term that encompasses both monoblastic and promonocytic subtypes. Myelomonocytic leukemia refers to a subtype of acute myeloid leukemia that affects both granulocytes and monocytes. While these terms may differ slightly in their precise definitions, they all describe a serious and life-threatening condition that requires prompt medical treatment.