leukocyte vs corpuscle

leukocyte and corpuscle both are nouns.

Word	Noun	Adjective	Verb	Adverb
leukocyte	Yes	No	No	No
corpuscle	Yes	No	No	No

As nouns, corpuscle is a hypernym of leukocyte; that is, corpuscle is a word with a broader meaning than leukocyte:

leukocyte: blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system
corpuscle: either of two types of cells (erythrocytes and leukocytes) and sometimes including platelets

Other hypernyms of leukocyte include blood cell, blood corpuscle, free phagocyte.

leukocyte (noun)	corpuscle (noun)
blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system	either of two types of cells (erythrocytes and leukocytes) and sometimes including platelets
	(nontechnical usage) a tiny piece of anything