For words that only have three letters, there's no 4th letter. For example with the word “incorporate”, there are no extra letters Later on and so have to be the word "add". The word “addict” is from the BIP39 wordlist however, you might have used “addi” for “addict”. Artwork is https://social-galaxy.com/story4285527/examine-this-report-on-bip39-passphrase