For words that only have three letters, there's no 4th letter. By way of example with the word “incorporate”, there won't be any extra letters afterwards and therefore should be the word "increase". The word “addict” is inside the BIP39 wordlist however you might have utilized “addi” for “addict”. Artwork https://directmysocial.com/story3451969/a-review-of-bip39-passphrase