For words that have only 3 letters, there's no 4th letter. For instance with the word “include”, there isn't any more letters Later on and therefore has to be the word "add". The word “addict” is during the BIP39 wordlist however , you might have used “addi” for “addict”. The https://45listing.com/story20745493/top-latest-five-bip39-words-urban-news