packed cells vs blood corpuscle

packed cells and blood corpuscle both are nouns.

Word	Noun	Adjective	Verb	Adverb
packed cells	Yes	No	No	No
blood corpuscle	Yes	No	No	No

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

packed cells: a preparation of blood cells separated from the liquid plasma
blood corpuscle: either of two types of cells (erythrocytes and leukocytes) and sometimes including platelets

Other hypernyms of packed cells include blood cell, corpuscle.

packed cells (noun)	blood corpuscle (noun)
a preparation of blood cells separated from the liquid plasma	either of two types of cells (erythrocytes and leukocytes) and sometimes including platelets