basivertebral vein vs vena

basivertebral vein and vena both are nouns.

Word	Noun	Adjective	Verb	Adverb
basivertebral vein	Yes	No	No	No
vena	Yes	No	No	No

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

basivertebral vein: one of a number of veins draining the spongy substance of the vertebrae and emptying into the anterior internal vertebral venous plexus
vena: a blood vessel that carries blood from the capillaries toward the heart

Other hypernyms of basivertebral vein include vein, venous blood vessel.

basivertebral vein (noun)	vena (noun)
one of a number of veins draining the spongy substance of the vertebrae and emptying into the anterior internal vertebral venous plexus	a blood vessel that carries blood from the capillaries toward the heart