For words that only have 3 letters, there's no 4th letter. For example with the word “incorporate”, there aren't any extra letters Later on and therefore has to be the word "incorporate". The word “addict” is inside the BIP39 wordlist but you might have utilized “addi” for “addict”. In this https://wildbookmarks.com/story19642363/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news