vena hemiazygos accessoria vs accessory hemiazygous vein

vena hemiazygos accessoria and accessory hemiazygous vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena hemiazygos accessoria	Yes	No	No	No
accessory hemiazygous vein	Yes	No	No	No

As nouns, vena hemiazygos accessoria and accessory hemiazygous vein are synonyms defined as:

vena hemiazygos accessoria and accessory hemiazygous vein: a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein

Other synonyms of vena hemiazygos accessoria include accessory hemiazygos vein.

vena hemiazygos accessoria (noun)	accessory hemiazygous vein (noun)
a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein	a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein