Some words that clearly have more than one meaning are being used to tag questions very specifically.
intent instead of android-intent
activity instead of android-activity
model instead of mvc-model
Note that someone has already put tag wikis on model and activity to confine them to specific uses.
Problem is, by the time these are caught, it is a real pain to fix them. The tag tools are entirely inadequate for dealing with them, because these tags are already being used in multiple contexts.
If I had a way to change the activity tag only for those questions having the android tag, for example, I could clean it up quite easily.