shaking palsy vs brain disorder

shaking palsy and brain disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
shaking palsy	Yes	No	No	No
brain disorder	Yes	No	No	No

As nouns, brain disorder is a hypernym of shaking palsy; that is, brain disorder is a word with a broader meaning than shaking palsy:

shaking palsy: a degenerative disorder of the central nervous system characterized by tremor and impaired muscular coordination
brain disorder: any disorder or disease of the brain

Other hypernyms of shaking palsy include degenerative disorder, brain disease, encephalopathy.

shaking palsy (noun)	brain disorder (noun)
a degenerative disorder of the central nervous system characterized by tremor and impaired muscular coordination	any disorder or disease of the brain