For words that only have 3 letters, there isn't a 4th letter. As an example with the word “add”, there won't be any far more letters afterwards and therefore must be the word "increase". The word “addict” is while in the BIP39 wordlist however you might have used “addi” for https://iwanttobookmark.com/story18915769/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator