For words that only have 3 letters, there is no 4th letter. Such as with the word “incorporate”, there are no more letters Later on and thus should be the word "add". The word “addict” is in the BIP39 wordlist however , you might have made use of “addi” for https://prbookmarkingwebsites.com/story21940852/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting