For words that only have three letters, there's no 4th letter. For instance with the word “increase”, there won't be any far more letters afterwards and so have to be the word "incorporate". The word “addict” is within the BIP39 wordlist however you would've utilized “addi” for “addict”. - Lưu https://atozbookmark.com/story18832121/a-review-of-bip39-phrase-list