Leukocytosis is a medical condition characterized by an abnormally high number of white blood cells in the body. However, there are several synonymous terms used for this condition, such as leukocythemia, leukemoid reaction, and leukocytopenia. While they mean the same thing, these different terms may indicate specific causes of the elevated white blood cells, such as leukemia or a response to an infection. Other related medical terms include neutrophilia for an increase in neutrophils, a type of white blood cell, and lymphocytosis for an increase in lymphocytes. Overall, understanding these synonymous terms for leukocytosis can help healthcare professionals determine potential causes and appropriate treatment plans for patients.