multiple sclerosis vs demyelination

multiple sclerosis and demyelination both are nouns.

Word	Noun	Adjective	Verb	Adverb
multiple sclerosis	Yes	No	No	No
demyelination	Yes	No	No	No

multiple sclerosis (noun)	demyelination (noun)
a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers	loss of the myelin covering of some nerve fibers resulting in their impaired function