Is there a difference between atherosclerosis and arteriosclerosis?

Not the same thing: Atherosclerosis is the most common type of arteriosclerosis, or hardening of the arteries, and caused by plaque building up in the vessel. Over time the plaque causes thickening of the walls of the artery. Stiffness and a loss of elasticity also result. To clarify, a patient with arteriosclerosis (hardened arteries) may not have atherosclerosis (plaque).

Little if Anything!: Different words for essentially same disease process. The disease (a) typically starts in later childhood (b) is an accumulation of white blood cells in the walls of arteries (c) no symptoms for decades because arteries enlarge in compensation (d) most events are without symptoms (despite tissue damage) & when symptoms finally do occur are commonly of sudden onset due to plaque rupture & clots.

None: They are used to describe the same thing.

None: They are two different terms for the same thing. Atherosclerosis is the formal term. Arteriosclerosis is an older less formal term.

Largely Nothing: 2 different words for largely the same disease process. Disease (a) typically starts in later childhood, is (b) due to an accumulation of white blood cells in the walls of the arteries, (c) no symptoms occur for decades, though arteries get stiffer (d) most events are without symptoms (despite tissue damage) when symptoms finally do occur, they are commonly of sudden onset due to plaque rupture.