For words that have only three letters, there is no 4th letter. For example with the word “include”, there isn't any a lot more letters Later on and so must be the word "add". The word “addict” is from the BIP39 wordlist however, you might have utilized “addi” for “addict”. https://hotbookmarkings.com/story18848047/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase