lumbar vein vs vena lumbalis

lumbar vein and vena lumbalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
lumbar vein	Yes	No	No	No
vena lumbalis	Yes	No	No	No

As nouns, lumbar vein and vena lumbalis are synonyms defined as:

lumbar vein and vena lumbalis: veins that drain the posterior body wall and the lumbar vertebral venous plexuses

lumbar vein (noun)	vena lumbalis (noun)
veins that drain the posterior body wall and the lumbar vertebral venous plexuses	veins that drain the posterior body wall and the lumbar vertebral venous plexuses