Lymphocytes are known to be white blood cells that can make sure that the immune system will be fighting all of the foreign objects that may enter the body that may eventually turn into other diseases. There are different types of lymphocytes that are available and they are all working towards making sure that the body will stay healthy.
Leukocytes, on the other hand, is a term that is used to describe the white blood cells that can be found in WBC exams and tests. This will be the term used in order to describe the number of white blood cells that can be found in a certain amount of blood. This should be in the normal levels because high white blood cell count can signify an infection.