If you have a long name that's difficult to spell or your job uses a lot of obscure terms, you've probably experienced the frustration that comes with typing long or complex words into your device. Next time you're in the middle of typing "Anastasia" or "NoSQL" into your text field, long-press on it. This will add it to the dictionary, so you'll no longer have to type more than the first few characters of the word.
Source :- informationweek