For words that only have three letters, there's no 4th letter. As an example with the word “add”, there isn't any additional letters afterwards and therefore need to be the word "incorporate". The word “addict” is from the BIP39 wordlist however you would've employed “addi” for “addict”. Retail store your https://peakbookmarks.com/story18938323/facts-about-bip39-seed-phrase-word-list-revealed