For words that only have 3 letters, there isn't a 4th letter. For example with the word “incorporate”, there isn't any more letters Later on and therefore should be the word "insert". The word “addict” is from the BIP39 wordlist however , you would have applied “addi” for “addict”. Tips https://bookmarkcolumn.com/story18616544/examine-this-report-on-bip39-passphrase