neutrophil vs leucocyte

neutrophil and leucocyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
neutrophil	Yes	No	No	No
leucocyte	Yes	No	No	No

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

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

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

neutrophil (noun)	leucocyte (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