accessory hemiazygous vein vs accessory hemiazygos vein

accessory hemiazygous vein and accessory hemiazygos vein both are nouns.

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

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

accessory hemiazygous vein 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 accessory hemiazygous vein include vena hemiazygos accessoria.

accessory hemiazygous vein (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