neutropenia vs leucopenia

neutropenia and leucopenia both are nouns.

Word	Noun	Adjective	Verb	Adverb
neutropenia	Yes	No	No	No
leucopenia	Yes	No	No	No

As nouns, leucopenia is a hypernym of neutropenia; that is, leucopenia is a word with a broader meaning than neutropenia:

neutropenia: leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte)
leucopenia: an abnormal lowering of the white blood cell count

Other hypernyms of neutropenia include leukopenia.

neutropenia (noun)	leucopenia (noun)
leukopenia in which the decrease is primarily in number of neutrophils (the chief phagocytic leukocyte)	an abnormal lowering of the white blood cell count