EFF has a new wordlist which can be used for things like this. It focuses on phonetic and spelling differences across each word so that this doesn't happen, plus it prevents words from "duplicating" when you combine them (ie the two words `in put` and `input` being the same).
Nice! As I started reading about it, I idly wondered if they talked to Marc Brysbaert, who is very serious about researching which words people know. And the answer is yes, they did.
https://www.eff.org/deeplinks/2016/07/new-wordlists-random-p...