thrombopenia vs blood disorder

thrombopenia and blood disorder both are nouns.

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

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

thrombopenia: a blood disease characterized by an abnormally small number of platelets in the blood
blood disorder: a disease or disorder of the blood

Other hypernyms of thrombopenia include blood disease.

thrombopenia (noun)	blood disorder (noun)
a blood disease characterized by an abnormally small number of platelets in the blood	a disease or disorder of the blood