Apple’s iOS 7 maintains a user dictionary of the words your iPhone learns after you reject an auto-correction suggestion. The iPhone trusts your judgment in such cases, so if you reject a suggestion in lieu of a misspelling or an inappropriate word, that word goes into your dictionary without question or prompting. You can remove these learned words, but it's an all-or-nothing endeavor that resets your entire user dictionary.

Step 1

Press the "Home" button on your iPhone to return to the main screen.

Step 2

Tap "Settings," select "General," and then tap "Reset" to access the iPhone's reset options.

Step 3

Tap "Reset Keyboard Dictionary," and then tap "Reset Dictionary" to remove all learned words from your iPhone.