For words that have only three letters, there isn't a 4th letter. As an example with the word “increase”, there aren't any much more letters afterwards and so must be the word "increase". The word “addict” is during the BIP39 wordlist however, you might have utilized “addi” for “addict”. gravity https://socialbraintech.com/story4033904/a-review-of-bip39-passphrase