leucocyte vs white blood cell

leucocyte and white blood cell both are nouns.

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

As nouns, leucocyte and white blood cell are synonyms defined as:

leucocyte and white blood cell: blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system

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

leucocyte (noun)	white blood cell (noun)
blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system	blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system