Cushing's syndrome vs hyperadrenocorticism

Cushing's syndrome and hyperadrenocorticism both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cushing's syndrome	Yes	No	No	No
hyperadrenocorticism	Yes	No	No	No

As nouns, Cushing's syndrome and hyperadrenocorticism are synonyms defined as:

Cushing's syndrome and hyperadrenocorticism: a glandular disorder caused by excessive cortisol

Cushing's syndrome (noun)	hyperadrenocorticism (noun)
a glandular disorder caused by excessive cortisol	a glandular disorder caused by excessive cortisol