coronary-artery disease vs hardening of the arteries

coronary-artery disease and hardening of the arteries both are nouns.

Word	Noun	Adjective	Verb	Adverb
coronary-artery disease	Yes	No	No	No
hardening of the arteries	Yes	No	No	No

As nouns, coronary-artery disease and hardening of the arteries are synonyms defined as:

coronary-artery disease and hardening of the arteries: sclerosis of the arterial walls

Other synonyms of coronary-artery disease include arterial sclerosis, arteriosclerosis, induration of the arteries.

coronary-artery disease (noun)	hardening of the arteries (noun)
sclerosis of the arterial walls	sclerosis of the arterial walls