diploic vein vs vena diploica

diploic vein and vena diploica both are nouns.

Word	Noun	Adjective	Verb	Adverb
diploic vein	Yes	No	No	No
vena diploica	Yes	No	No	No

As nouns, diploic vein and vena diploica are synonyms defined as:

diploic vein and vena diploica: one of the veins serving the spongy part of the cranial bones

diploic vein (noun)	vena diploica (noun)
one of the veins serving the spongy part of the cranial bones	one of the veins serving the spongy part of the cranial bones