For words that only have three letters, there is no 4th letter. One example is with the word “incorporate”, there are no much more letters afterwards and so must be the word "include". The word “addict” is during the BIP39 wordlist but you might have utilized “addi” for “addict”. Shop https://bookmarkja.com/story20968702/the-definitive-guide-to-bip39-seed-phrase