For words that have only 3 letters, there's no 4th letter. As an example with the word “include”, there won't be any a lot more letters Later on and therefore have to be the word "increase". The word “addict” is within the BIP39 wordlist however , you would've used “addi” https://bookmarklogin.com/story19594379/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase