vena anastomotica vs vena

vena anastomotica and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena anastomotica	Yes	No	No	No
vena	Yes	No	No	No

As nouns, vena is a hypernym of vena anastomotica; that is, vena is a word with a broader meaning than vena anastomotica:

vena anastomotica: either of two communicating veins serving the brain
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of vena anastomotica include vein, venous blood vessel.

vena anastomotica (noun)	vena (noun)
either of two communicating veins serving the brain	a blood vessel that carries blood from the capillaries toward the heart