black disease vs distomatosis

black disease and distomatosis both are nouns.

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

As nouns, black disease and distomatosis are synonyms defined as:

black disease and distomatosis: a disease of the liver (especially in sheep and cattle) caused by liver flukes and their by-products

Other synonyms of black disease include liver rot, sheep rot.

black disease (noun)	distomatosis (noun)
a disease of the liver (especially in sheep and cattle) caused by liver flukes and their by-products	a disease of the liver (especially in sheep and cattle) caused by liver flukes and their by-products