For words that only have 3 letters, there's no 4th letter. For example with the word “include”, there aren't any a lot more letters afterwards and therefore has to be the word "incorporate". The word “addict” is in the BIP39 wordlist however , you might have utilized “addi” for “addict”. https://letusbookmark.com/story20434264/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting