Parkinson's vs encephalopathy

Parkinson's and encephalopathy both are nouns.

Word	Noun	Adjective	Verb	Adverb
Parkinson's	Yes	No	No	No
encephalopathy	Yes	No	No	No

As nouns, encephalopathy is a hypernym of Parkinson's; that is, encephalopathy is a word with a broader meaning than Parkinson's:

Parkinson's: a degenerative disorder of the central nervous system characterized by tremor and impaired muscular coordination
encephalopathy: any disorder or disease of the brain

Other hypernyms of Parkinson's include degenerative disorder, brain disease, brain disorder.

Parkinson's (noun)	encephalopathy (noun)
a degenerative disorder of the central nervous system characterized by tremor and impaired muscular coordination	any disorder or disease of the brain