Without knowing what device you are using, and what app you are having this issue in, it is a tad complicated to give exact info. Try the following...
How to turn on/off Predictive Text/Text Suggestions.
Depending on your device, and android version, there are a few different ways to turn this option on/off.
Option 1.
1. Go to "Settings" and then tap "Language & Input".
2. Next tap "Default" (keyboard) and then tap your default keyboard.
3. Now tap "Configure Input Methods" and then tap "Settings" next to the keyboard you are wanting to alter.
4. Here tap "Text Input Settings", then tap "Word Suggestions".
5. On this next screen tap the option you wish to have used.
You should now have/not have the suggestions bar, depending on...