For words that have only 3 letters, there is not any 4th letter. By way of example with the word “incorporate”, there isn't any a lot more letters afterwards and thus has to be the word "increase". The word “addict” is from the BIP39 wordlist but you might have made https://franciscougju442.bravesites.com/entries/general/Opening-the-Power-of-BIP39-An-Extensive-Consider-Word-Lists-and-Secure-Budgets