Is there a name for the common ground between Lion and iOS 5?
I happen to be writing a book on iCloud now, and I've had to deal with some of these issues. It's instructive to note that although the respective applications on Lion, iOS 5, and the iCloud Web site are Address Book, Contacts, and Contacts, respectively. They all are containers for one thing, which they use the same terminology: Contacts. 

I do not plan to use the terms you suggest above; rather, I am saying things like "entering contacts in Address Book," "entering contacts in Contacts," "changing contacts on the iCloud Web site." It's the context that matters, since the set of data is the same, and enforced by syncing.