Use APKPure App
Get User Dictionary Backup old version APK for Android
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UDB (User Dictionary Backup) allows you to Backup and Restore words you stored manually in the Dictionary. It also allows you to import words from a .txt list of words (each in a new line, placed in the "UserDictionaries" Folder.)
**This App might not work on Phones which provide their built-in Backup/Restore options for the User Dictionary.