If I have a page or window that allows the user to manage something, for example a subscription, should the title be "Manage subscription" or "Subscription management?" Which word order gives the best clarity and does this principle apply to other labels (like tabs)?
If it's a page title, use a noun. If it's something that indicates an action, use a verb.
For example; if you go to your management page, call it 'x management'. On that page, when you want to add an item, label the button 'add item'.