arterial sclerosis vs hardening of the arteries

arterial sclerosis and hardening of the arteries both are nouns.

Word	Noun	Adjective	Verb	Adverb
arterial sclerosis	Yes	No	No	No
hardening of the arteries	Yes	No	No	No

As nouns, arterial sclerosis and hardening of the arteries are synonyms defined as:

arterial sclerosis and hardening of the arteries: sclerosis of the arterial walls

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

arterial sclerosis (noun)	hardening of the arteries (noun)
sclerosis of the arterial walls	sclerosis of the arterial walls