accessory hemiazygos vein vs accessory hemiazygous vein

accessory hemiazygos vein and accessory hemiazygous vein both are nouns.

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

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

accessory hemiazygos vein 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 accessory hemiazygos vein include vena hemiazygos accessoria.

accessory hemiazygos vein (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