vena circumflexa vs circumflex vein

vena circumflexa and circumflex vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena circumflexa	Yes	No	No	No
circumflex vein	Yes	No	No	No

As nouns, vena circumflexa and circumflex vein are synonyms defined as:

vena circumflexa and circumflex vein: any of several curved parallel veins accompanying arteries of the same name

vena circumflexa (noun)	circumflex vein (noun)
any of several curved parallel veins accompanying arteries of the same name	any of several curved parallel veins accompanying arteries of the same name