For words that have only three letters, there is no 4th letter. For example with the word “incorporate”, there aren't any additional letters Later on and thus should be the word "add". The word “addict” is during the BIP39 wordlist however , you might have used “addi” for “addict”. Safety: https://prbookmarkingwebsites.com/story22227431/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news