anemia vs blood disease

anemia and blood disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
anemia	Yes	No	No	No
blood disease	Yes	No	No	No

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

Other hypernyms of anemia include blood disorder.

anemia (noun)	blood disease (noun)
a deficiency of red blood cells	a disease or disorder of the blood
a lack of vitality