For words that only have three letters, there is no 4th letter. Such as with the word “include”, there won't be any a lot more letters Later on and thus has to be the word "include". The word “addict” is during the BIP39 wordlist however, you might have utilized “addi” https://thesocialdelight.com/story4342883/a-secret-weapon-for-bip39-words-to-numbers