vena labialis superior vs superior labial vein

vena labialis superior and superior labial vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena labialis superior	Yes	No	No	No
superior labial vein	Yes	No	No	No

As nouns, vena labialis superior and superior labial vein are synonyms defined as:

vena labialis superior and superior labial vein: a tributary of the facial vein that drains the upper lip

vena labialis superior (noun)	superior labial vein (noun)
a tributary of the facial vein that drains the upper lip	a tributary of the facial vein that drains the upper lip