sideroblast vs erythroblast

sideroblast and erythroblast both are nouns.

Word	Noun	Adjective	Verb	Adverb
sideroblast	Yes	No	No	No
erythroblast	Yes	No	No	No

As nouns, erythroblast is a hypernym of sideroblast; that is, erythroblast is a word with a broader meaning than sideroblast:

sideroblast: an erythroblast having granules of ferritin
erythroblast: a nucleated cell in bone marrow from which red blood cells develop

sideroblast (noun)	erythroblast (noun)
an erythroblast having granules of ferritin	a nucleated cell in bone marrow from which red blood cells develop