saphenous vein vs vena saphena

saphenous vein and vena saphena both are nouns.

Word	Noun	Adjective	Verb	Adverb
saphenous vein	Yes	No	No	No
vena saphena	Yes	No	No	No

As nouns, saphenous vein and vena saphena are synonyms defined as:

saphenous vein and vena saphena: either of two chief superficial veins of the leg that drain blood from the foot

saphenous vein (noun)	vena saphena (noun)
either of two chief superficial veins of the leg that drain blood from the foot	either of two chief superficial veins of the leg that drain blood from the foot