For words that only have 3 letters, there is not any 4th letter. By way of example with the word “incorporate”, there aren't any more letters Later on and therefore should be the word "increase". The word “addict” is inside the BIP39 wordlist but you might have utilised “addi” for https://bookmarkproduct.com/story19040875/a-review-of-bip39-passphrase