not too sure about Acrobat, but with Reader, its mostly the application and the plug-ins, but I think there are also some support files in both /Library/Application Support/Adobe/Reader/ and ~/Library/Application Support/Adobe/Acrobat/
I'd look in those locations to see what may need to be removed for a complete uninstall. Then there are plist files too if you want to go that far...
I use a free application called App Cleaner to get an idea of what files go with certain applications. Just drag Acrobat in and see what files go with it...

Adobe has a CC Cleaner tool:
https://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html