In my opinion the two are different, despite the same word origin. Allow me to exaggerate for a bit: "application" implies desktop: you would run the installer

In my opinion the two are different, despite the same word origin. Allow me to exaggerate for a bit: "application" implies desktop: you would run the installer, it would be a powerful (and complex) tool, capable of interacting with other local tools. OTOH, "app" implies the everything-is-mobile paradigm: you ask the WhateverStore to install it for you, and if you've been nice and the phase of the moon is right, your plea is granted. Complexity is discouraged, drool-proof colorful interface is encouraged, the only allowed interaction is with the Big Walled Garden In The Cloud. So, yes: Win10 has apps, and it's trying its damnedest not to have applications.