arteriosclerosis vs hardening of the arteries

arteriosclerosis and hardening of the arteries both are nouns.

Word	Noun	Adjective	Verb	Adverb
arteriosclerosis	Yes	No	No	No
hardening of the arteries	Yes	No	No	No

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

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

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

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