spherocyte vs red blood cell

spherocyte and red blood cell both are nouns.

Word	Noun	Adjective	Verb	Adverb
spherocyte	Yes	No	No	No
red blood cell	Yes	No	No	No

As nouns, red blood cell is a hypernym of spherocyte; that is, red blood cell is a word with a broader meaning than spherocyte:

spherocyte: an abnormal spherical red blood cell
red blood cell: a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus

Other hypernyms of spherocyte include erythrocyte, RBC.

spherocyte (noun)	red blood cell (noun)
an abnormal spherical red blood cell	a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus