brain disorder vs encephalopathy

brain disorder and encephalopathy both are nouns.

Word	Noun	Adjective	Verb	Adverb
brain disorder	Yes	No	No	No
encephalopathy	Yes	No	No	No

As nouns, brain disorder and encephalopathy are synonyms defined as:

Other synonyms of brain disorder include brain disease.

brain disorder (noun)	encephalopathy (noun)
any disorder or disease of the brain	any disorder or disease of the brain