There is a new release on available in testing which will be released soon with a a navigation to words with the same root. For words with a root there will be a navigation icon that will replace the dictionary lookup with Arabic words that has this root. A chip in the input field will show that you are looking at a list of words for a root, and you can go back to the previous lookup by dismissing the chip.
If you want to try it out now, join the app testing tracks for iOS or Android :)
You can also check out the new web app at https://dev.aratools.com. New features are usually released and tested here first.