For words that have only three letters, there isn't a 4th letter. Such as with the word “increase”, there isn't any a lot more letters afterwards and therefore have to be the word "incorporate". The word “addict” is in the BIP39 wordlist however , you might have used “addi” for https://dmozbookmark.com/story19055872/helping-the-others-realize-the-advantages-of-bip39-seed-phrase-mnemonics-generator