vena emissaria vs emissary vein

vena emissaria and emissary vein both are nouns.

Word	Noun	Adjective	Verb	Adverb
vena emissaria	Yes	No	No	No
emissary vein	Yes	No	No	No

As nouns, vena emissaria and emissary vein are synonyms defined as:

vena emissaria and emissary vein: one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull

vena emissaria (noun)	emissary vein (noun)
one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull	one of several connecting veins in the scalp and head that drain blood from sinuses in the dura mater to veins outside the skull