pancytopenia vs cytopenia

pancytopenia and cytopenia both are nouns.

Word	Noun	Adjective	Verb	Adverb
pancytopenia	Yes	No	No	No
cytopenia	Yes	No	No	No

As nouns, cytopenia is a hypernym of pancytopenia; that is, cytopenia is a word with a broader meaning than pancytopenia:

pancytopenia: an abnormal deficiency in all blood cells (red blood cells and white blood cells and platelets); usually associated with bone marrow tumor or with aplastic anemia
cytopenia: a deficiency of some cellular element of the blood

pancytopenia (noun)	cytopenia (noun)
an abnormal deficiency in all blood cells (red blood cells and white blood cells and platelets); usually associated with bone marrow tumor or with aplastic anemia	a deficiency of some cellular element of the blood