From the creator of the xkcd webcomic (and not kinky unless you make it so):
Want to try writing using only simple words? Here’s a writing checker you can use: xkcd.com/simplewriter. To help me write the words in my Up Goer Five picture, I taught my computer to watch my writing and tell me when one of the words I used wasn’t in the top ten hundred.…
Source: A Thing Explainer word checker
Or, you could use it in reverse and try to maximize the uncommon words.