Leucocyte is a term commonly used in biology and medicine to describe a white blood cell. However, depending on the context, there are several synonyms that can also be used to refer to this type of cell. One such synonym is leukocyte, which is actually a more commonly used spelling variation. Other synonyms include white blood cells, white cells, and lymphocytes. These terms all describe various types of cells that are important to the functioning of the human immune system. By using these different synonyms in scientific and medical writing, professionals can avoid repetition and add variety to their language.