umbilical vesicle vs vitelline sac

umbilical vesicle and vitelline sac both are nouns.

Word	Noun	Adjective	Verb	Adverb
umbilical vesicle	Yes	No	No	No
vitelline sac	Yes	No	No	No

As nouns, umbilical vesicle and vitelline sac are synonyms defined as:

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

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

umbilical vesicle (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