microcytosis vs blood disease

microcytosis and blood disease both are nouns.

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

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

microcytosis: a blood disorder characterized by the presence of microcytes (abnormally small red blood cells) in the blood; often associated with anemia
blood disease: a disease or disorder of the blood

Other hypernyms of microcytosis include blood disorder.

microcytosis (noun)	blood disease (noun)
a blood disorder characterized by the presence of microcytes (abnormally small red blood cells) in the blood; often associated with anemia	a disease or disorder of the blood