For words that only have three letters, there is absolutely no 4th letter. For instance with the word “incorporate”, there aren't any far more letters afterwards and therefore needs to be the word "include". The word “addict” is in the BIP39 wordlist however, you would've utilized “addi” for “addict”. Security: https://1001bookmarks.com/story18791891/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news