For words that have only 3 letters, there is no 4th letter. For example with the word “increase”, there isn't any far more letters afterwards and therefore should be the word "add". The word “addict” is from the BIP39 wordlist however you might have applied “addi” for “addict”. Standard recovery https://7bookmarks.com/story18831835/the-invalid-bip39-phrase-diaries