neutrophil vs white blood cell

neutrophil and white blood cell both are nouns.

Word	Noun	Adjective	Verb	Adverb
neutrophil	Yes	No	No	No
white blood cell	Yes	No	No	No

As nouns, white blood cell is a hypernym of neutrophil; that is, white blood cell is a word with a broader meaning than neutrophil:

neutrophil: the chief phagocytic leukocyte; stains with either basic or acid dyes
white blood cell: blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system

Other hypernyms of neutrophil include leucocyte, leukocyte, WBC, white blood corpuscle, white cell, white corpuscle.

neutrophil (noun)	white blood cell (noun)
the chief phagocytic leukocyte; stains with either basic or acid dyes	blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system