For words that have only 3 letters, there is not any 4th letter. Such as with the word “add”, there won't be any more letters Later on and so need to be the word "add". The word “addict” is within the BIP39 wordlist but you would have utilized “addi” for https://ez-bookmarking.com/story18789443/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool