For words that only have three letters, there is no 4th letter. For example with the word “include”, there are no far more letters afterwards and therefore has to be the word "increase". The word “addict” is while in the BIP39 wordlist but you might have utilized “addi” for “addict”. https://socialwebconsult.com/story4196641/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator