For words that have only three letters, there is no 4th letter. Such as with the word “add”, there isn't any additional letters afterwards and so need to be the word "include". The word “addict” is during the BIP39 wordlist however you would've employed “addi” for “addict”. You signed in https://bookmark-nation.com/story18795295/a-review-of-bip39-passphrase