For words that have only 3 letters, there isn't a 4th letter. One example is with the word “add”, there are no extra letters Later on and therefore should be the word "increase". The word “addict” is in the BIP39 wordlist but you would have utilised “addi” for “addict”. gravity https://enrollbookmarks.com/story19092862/a-review-of-bip39-phrase-list