For words that only have three letters, there's no 4th letter. Such as with the word “increase”, there aren't any much more letters afterwards and thus needs to be the word "increase". The word “addict” is during the BIP39 wordlist however you would have applied “addi” for “addict”. This additional https://socialbaskets.com/story5064158/5-simple-techniques-for-bip39-seed-phrase