vena hemiazygos accessoria vs accessory hemiazygos vein

vena hemiazygos accessoria and accessory hemiazygos vein both are nouns.

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

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

vena hemiazygos accessoria and accessory hemiazygos 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 hemiazygous vein.

vena hemiazygos accessoria (noun)	accessory hemiazygos 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