confusables are sometimes used to generate tricky answers for the multiple choice.
if there are insufficient confusables, auto confusables can be used: in multi-char words, use words that have one or more of the chars in common. also use parents and children. or characters that share parents or children.
also, auto-confusables could show up when editing a word so curators can easily add them to confusables, or, alternately, opt out of them.