hardening of the arteries vs arteriosclerosis

hardening of the arteries and arteriosclerosis both are nouns.

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

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

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

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

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