Earlier quoted context omitted.
The game has two lists -- one list that includes 'valid guesses' (things you can enter), and one that is a list of things that could actually end up as the solution. From the possible solutions list, they removed words that have negative associations -- stuff like "slave." From the guesses list, they mostly removed things like slurs.
What's the game's reason for having two lists instead of just one?
The value is that we all get the same answer, so which makes it more fun to compare our results (this does mean that you can just cheat and look up the answer, and it might have been possible to obscure the list somehow, but probably getting into an escalating war with cheaters was not a priority for such a simple little free game).