For words that only have 3 letters, there isn't any 4th letter. For instance with the word “include”, there won't be any far more letters afterwards and thus must be the word "incorporate". The word “addict” is during the BIP39 wordlist but you would've applied “addi” for “addict”. By pursuing https://socialevity.com/story21430412/the-fact-about-bip39-seed-phrase-word-list-that-no-one-is-suggesting