Comment 4 for bug 969931

What about Activities and Tasks?
An Activity is often a prologed task made of multple steps(Tasks).

But the better solution in my opinion would be to not use different names (or even different implementation) for complex or simple tasks.
There is no need to.
A Task is a Task.
Users could jot down their todo list and then, if needed, they can split the complex ones in subtasks, subsubtasks and so on