vesicula umbilicus vs vitelline sac

vesicula umbilicus and vitelline sac both are nouns.

Word	Noun	Adjective	Verb	Adverb
vesicula umbilicus	Yes	No	No	No
vitelline sac	Yes	No	No	No

As nouns, vesicula umbilicus and vitelline sac are synonyms defined as:

vesicula umbilicus and vitelline sac: membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional

Other synonyms of vesicula umbilicus include umbilical vesicle, yolk sac.

vesicula umbilicus (noun)	vitelline sac (noun)
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional	membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional