vena hemizygos vs hemizygous vein

vena hemizygos and hemizygous vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena hemizygos	Yes	No	No	No
hemizygous vein	Yes	No	No	No

As nouns, vena hemizygos and hemizygous vein are synonyms defined as:

vena hemizygos and hemizygous vein: a continuation of the left ascending lumbar vein; crosses the midline at the 8th vertebra and empties into the azygos vein

Other synonyms of vena hemizygos include hemizygos vein.

vena hemizygos (noun)	hemizygous vein (noun)
a continuation of the left ascending lumbar vein; crosses the midline at the 8th vertebra and empties into the azygos vein	a continuation of the left ascending lumbar vein; crosses the midline at the 8th vertebra and empties into the azygos vein