vena brachialis vs brachial vein

vena brachialis and brachial vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena brachialis	Yes	No	No	No
brachial vein	Yes	No	No	No

As nouns, vena brachialis and brachial vein are synonyms defined as:

vena brachialis and brachial vein: two veins in either arm that accompany the brachial artery and empty into the axillary vein

vena brachialis (noun)	brachial vein (noun)
two veins in either arm that accompany the brachial artery and empty into the axillary vein	two veins in either arm that accompany the brachial artery and empty into the axillary vein