For questions about attack rolls, a randomized event (usually performed with dice) that determines whether one character can strike another character or entity.
For questions about attacks. An attack is an action that can be taken by a vast number of entities that either can cause damage, a debilitation of some sort, or both, though specific RPGs may define the term more specifically.
It seems to me that attack-roll should be covered already by attack, so I don't see a use for having attack-roll be its own thing. So I'm putting this forward for community discussion.