Leukocyte is another name for white blood cells, while lymphocytes are types of white blood cells. Basically, all lymphocytes are leukocytes. However, not all leukocytes are lymphocytes. Leukocytes can be divided into two.
This depends on the presence of granules in the cytoplasm. Granulocytes and agranulocytes. The granulocytes of three different types can be found in the blood; they include neutrophils, eosinophils, and basophils. Agranulocytes include monocytes and lymphocytes.
The lymphocytes are found in the agranulocytes; it is composed of T lymphocytes, B lymphocytes, and a null group that contains killer cells and cytotoxic cells. Leukocytes are involved in both innate and adaptive immunity during host defense, while lymphocytes are involved in adaptive immunity during the defense.