For words that have only three letters, there's no 4th letter. By way of example with the word “increase”, there are no a lot more letters afterwards and so need to be the word "incorporate". The word “addict” is inside the BIP39 wordlist however , you might have made use https://www.symbaloo.com/embed/shared/AAAACHlsY-AAA42AhQqHKA==