For words that only have three letters, there is not any 4th letter. One example is with the word “include”, there isn't any a lot more letters afterwards and therefore should be the word "add". The word “addict” is from the BIP39 wordlist however, you might have applied “addi” for https://mnobookmarks.com/story18882384/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase