For words that have only three letters, there isn't a 4th letter. For example with the word “incorporate”, there isn't any extra letters afterwards and thus should be the word "add". The word “addict” is in the BIP39 wordlist however , you might have employed “addi” for “addict”. Standard recovery https://social40.com/story4490686/the-fact-about-valid-bip39-seed-phrase-that-no-one-is-suggesting