For words that have only three letters, there's no 4th letter. For example with the word “add”, there won't be any extra letters afterwards and therefore have to be the word "incorporate". The word “addict” is during the BIP39 wordlist but you might have applied “addi” for “addict”. By next https://www.symbaloo.com/embed/shared/AAAACHlsY-AAA42AhQqHKA==