For words that only have three letters, there isn't any 4th letter. By way of example with the word “include”, there isn't any a lot more letters Later on and therefore has to be the word "add". The word “addict” is from the BIP39 wordlist but you might have utilised https://tripsbookmarks.com/story18950875/the-basic-principles-of-bip39-passphrase-generator