anaemia vs blood disease

anaemia and blood disease both are nouns.

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

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

Other hypernyms of anaemia include blood disorder.

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