monocyte vs leucocyte

monocyte and leucocyte both are nouns.

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

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

monocyte: a type of granular leukocyte that functions in the ingestion of bacteria
leucocyte: blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system

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

monocyte (noun)	leucocyte (noun)
a type of granular leukocyte that functions in the ingestion of bacteria	blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system