For words that have only 3 letters, there isn't a 4th letter. As an example with the word “include”, there isn't any far more 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”. https://bookmarktune.com/story18756576/the-greatest-guide-to-seed-phrase-bip39