black disease vs animal disease

black disease and animal disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
black disease	Yes	No	No	No
animal disease	Yes	No	No	No

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

black disease: a disease of the liver (especially in sheep and cattle) caused by liver flukes and their by-products
animal disease: a disease that typically does not affect human beings

black disease (noun)	animal disease (noun)
a disease of the liver (especially in sheep and cattle) caused by liver flukes and their by-products	a disease that typically does not affect human beings