For words that have only three letters, there is no 4th letter. Such as with the word “add”, there aren't any far more letters Later on and so must be the word "insert". The word “addict” is during the BIP39 wordlist however , you would've used “addi” for “addict”. The https://bookmarkilo.com/story19486830/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news