lymphopenia vs blood disorder

lymphopenia and blood disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
lymphopenia	Yes	No	No	No
blood disorder	Yes	No	No	No

As nouns, blood disorder is a hypernym of lymphopenia; that is, blood disorder is a word with a broader meaning than lymphopenia:

lymphopenia: an abnormally small number of lymphocytes in the circulating blood
blood disorder: a disease or disorder of the blood

Other hypernyms of lymphopenia include blood disease.

lymphopenia (noun)	blood disorder (noun)
an abnormally small number of lymphocytes in the circulating blood	a disease or disorder of the blood