For words that only have three letters, there isn't any 4th letter. For instance with the word “insert”, there won't be any a lot more letters Later on and so need to be the word "increase". The word “addict” is inside the BIP39 wordlist but you might have utilized “addi” https://bookmarkswing.com/story20310194/new-step-by-step-map-for-bip39-english-words