vena circumflexa vs vena

vena circumflexa and vena both are nouns.

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

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

vena circumflexa: any of several curved parallel veins accompanying arteries of the same name
vena: a blood vessel that carries blood from the capillaries toward the heart

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

vena circumflexa (noun)	vena (noun)
any of several curved parallel veins accompanying arteries of the same name	a blood vessel that carries blood from the capillaries toward the heart