The personal dictionary on the LG device manages words you have added yourself and can be used as a word suggestion, while the personal dictionary allows you to add, edit and delete your own words.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Language & keyboard
Step 4:  Tap on  On-screen keyboard
Step 5:  Tap on  LG Keyboard
Step 6:  Tap on  Word suggestions
Step 7:  Tap on  Personal dictionary
Step 8:  Tap on  Add
Step 9:  Enter a  Word  and tap on  Save
  1. Open the Settings
  2. Tap on General
  3. Tap on Language & keyboard
  4. Tap on On-screen keyboard
  5. Tap on LG Keyboard
  6. Tap on Word suggestions
  7. Tap on Personal dictionary
  8. Tap on Add
  9. Enter a Word and tap on Save

LG Instructions