siderocyte vs erythrocyte

siderocyte and erythrocyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
siderocyte	Yes	No	No	No
erythrocyte	Yes	No	No	No

As nouns, erythrocyte is a hypernym of siderocyte; that is, erythrocyte is a word with a broader meaning than siderocyte:

siderocyte: an abnormal red blood cell containing granules of iron not bound in hemoglobin
erythrocyte: a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus

Other hypernyms of siderocyte include RBC, red blood cell.

siderocyte (noun)	erythrocyte (noun)
an abnormal red blood cell containing granules of iron not bound in hemoglobin	a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus