vena saphena vs saphenous vein

vena saphena and saphenous vein both are nouns.

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

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

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

vena saphena (noun)	saphenous vein (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