For words that have only three letters, there isn't a 4th letter. For instance with the word “increase”, there aren't any a lot more letters Later on and thus should be the word "add". The word “addict” is inside the BIP39 wordlist however, you would have applied “addi” for “addict”. https://admiralbookmarks.com/story19505315/examine-this-report-on-bip39-passphrase