black lung vs black lung disease

black lung and black lung disease both are nouns.

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

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

black lung and black lung disease: lung disease caused by inhaling coal dust

Other synonyms of black lung include anthracosis, coal miner's lung.

black lung (noun)	black lung disease (noun)
lung disease caused by inhaling coal dust	lung disease caused by inhaling coal dust