spinal vein vs medulla spinalis

spinal vein and medulla spinalis both are nouns.

Word	Noun	Adjective	Verb	Adverb
spinal vein	Yes	No	No	No
medulla spinalis	Yes	No	No	No

spinal vein (noun)	medulla spinalis (noun)
veins that drain the spinal cord	a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain; a long tubelike structure extending from the base of the brain through the vertebral canal to the upper lumbar region