Addison's syndrome vs adenosis

Addison's syndrome and adenosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Addison's syndrome	Yes	No	No	No
adenosis	Yes	No	No	No

As nouns, adenosis is a hypernym of Addison's syndrome; that is, adenosis is a word with a broader meaning than Addison's syndrome:

Addison's syndrome: a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin
adenosis: a disorder of the glands of the body

Other hypernyms of Addison's syndrome include gland disease, glandular disease, glandular disorder.

Addison's syndrome (noun)	adenosis (noun)
a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin	a disorder of the glands of the body