title: Best Way to Check if a Word is Valid from a .txt
body: <p>I'm trying to create some kind of a word game using Unity with C#. I want my app to be working offline, so I can't use web API's. I found a text file of nearly 55k words, but what would be the most optimized way of using it? I just want to check if the String entered is a valid word. I'm guessing I can't just create a list of 55k elements and check every one of them, even with sorting algorithms. So, how can other apps achieve this without destroying my device? What is the secret? Thanks!</p>