There are five different kinds of white blood cells or WBC:
neutrophils: faint pink in color, multi-lobed nucleus, fight bacterial infection, found primarily in spleen.
eosinophils: pink in color, bi-lobed nuclei, fight parasitic infection, respond to allergic conditions
basophils: Large in size, bi-lobed or tri-lobed nuclei, blue in color, release histamines and respond to inflammation
lymphocytes: primarily two types, release antibodies, responsible for providing immunity to body, blue
monocytes: have large kidney shaped nucleus, migrate from blood to other tissues and can differentiate into specific cell types required for that tissue.
Hope this helps