spinal fluid vs medulla spinalis

spinal fluid and medulla spinalis both are nouns.

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

spinal fluid (noun)	medulla spinalis (noun)
clear liquid produced in the ventricles of the brain; fills and protects cavities in the brain and 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