For words that have only three letters, there is not any 4th letter. One example is with the word “include”, there isn't any far more letters afterwards and therefore should be the word "increase". The word “addict” is inside the BIP39 wordlist but you might have made use of “addi” https://www.animenewsnetwork.com/bbs/phpBB2/profile.php?mode=viewprofile&u=1025088