How can I stop the automatic spell checker from changing my spelling of a new word? The word is catheist.
You can’t stop it for one word. The only thing you can do is turn off auto-correct altogether. Go to Settings and turn auto-correct to “off” Leave Spell-Check on. I turned mine off a long time ago. Auto-correct is more trouble than it’s worth. The spell checker program will still tell you when a word is spelled incorrectly, but it won’t automatically change it.
On the iPad, the auto-correct settings are under “keyboard.”