hypoadrenalism vs gland disease

hypoadrenalism and gland disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypoadrenalism	Yes	No	No	No
gland disease	Yes	No	No	No

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

hypoadrenalism: a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin
gland disease: a disorder of the glands of the body

Other hypernyms of hypoadrenalism include adenosis, glandular disease, glandular disorder.

hypoadrenalism (noun)	gland disease (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