acataphasia vs brain disease

acataphasia and brain disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
acataphasia	Yes	No	No	No
brain disease	Yes	No	No	No

As nouns, brain disease is a hypernym of acataphasia; that is, brain disease is a word with a broader meaning than acataphasia:

acataphasia: a disorder in which a lesion to the central nervous system leaves you unable to formulate a statement or to express yourself in an organized manner
brain disease: any disorder or disease of the brain

Other hypernyms of acataphasia include brain disorder, encephalopathy.

acataphasia (noun)	brain disease (noun)
a disorder in which a lesion to the central nervous system leaves you unable to formulate a statement or to express yourself in an organized manner	any disorder or disease of the brain