For words that only have three letters, there isn't any 4th letter. Such as with the word “add”, there aren't any a lot more letters afterwards and therefore should be the word "increase". The word “addict” is while in the BIP39 wordlist however you might have utilized “addi” for “addict”. https://scrapbookmarket.com/story18822037/the-5-second-trick-for-ledger-seed-phrase-bip39