When you've been using a system for a while you just take some oddities for granted, however for new users irregularities in terminology all help to make the learning curve steeper.
What's the difference between "User" (as used in many list view filters) and "Record Manager" (as used in the drop-down list in the field of the same name)?
Answer: Nothing. They're the same. So let's use just one term, not two.
What's the difference between "Activities" (the things we schedule) and "Tasks"?
Answer: Nothing. They're the same. So let's just use one term not two. Why do we view Activities in the Activity Tab in our Contact records but also view the same thing in the Task List? Logically we either need to rename the Activities tab "tasks" or rename the Task List "Activity List".