MS vs sclerosis

MS and sclerosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
MS	Yes	No	No	No
sclerosis	Yes	No	No	No

As nouns, sclerosis is a hypernym of MS; that is, sclerosis is a word with a broader meaning than MS:

MS: a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers
sclerosis: any pathological hardening or thickening of tissue

MS (noun)	sclerosis (noun)
a master's degree in science	any pathological hardening or thickening of tissue
a state in the Deep South on the gulf of Mexico; one of the Confederate States during the American Civil War
a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers