vena hemizygos vs hemizygos vein

vena hemizygos and hemizygos vein both are nouns.

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

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

vena hemizygos and hemizygos 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 hemizygous vein.

vena hemizygos (noun)	hemizygos 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