White corpuscles, also known as leukocytes, are essentially immune system cells that are crucial for fighting infections and diseases. While the term "white corpuscle" is commonly used in medical literature, there are other synonyms that are also widely used. These include white blood cells, immune cells, infection fighters, defense cells, and lymphocytes. Each of these synonyms highlights the critical role of leukocytes in maintaining our overall health and well-being. By recognizing these synonyms, patients and healthcare providers can better understand the importance of these crucial immune system cells in protecting us from harm.