Some find the predictive text feature on Android keyboard very useful and some other find it annoying. Disable predictive text on Galaxy Note 3, Galaxy S4 by doing as follows:
1. Open Settings application and go to Controls tab
2. Open Language and Input settings
3. Go to Samsung Keyboard settings (Tap the settings icon next to the Samsung keyboard)
4. Under Smart Typing, make sure to disable the Predictive Text option.
Read more Galaxy Note 3 Tips and Tricks