Quran Search is a great application that allows you to search the whole Quran in Arabic. The application is free to use and has an easy interface to understand. The best thing is that you can search for any word, even if you don't know the exact spelling of it.

The app has a search function that works as follows: you type in the search box the word that you want to find, and the app will find all the words that are present in the Quran and will give you the exact word that you want. You can even find the exact word in any chapter or surah of the Quran.

If you want to use this application, you need to make sure that you have the latest version of it installed on your device. The app is available for free on Google Play.