erythrocyte vs red blood cell

erythrocyte and red blood cell both are nouns.

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

As nouns, erythrocyte and red blood cell are synonyms defined as:

erythrocyte and 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 synonyms of erythrocyte include RBC.

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