For words that only have three letters, there isn't any 4th letter. Such as with the word “include”, there isn't any a lot more letters afterwards and thus must be the word "incorporate". The word “addict” is during the BIP39 wordlist however, you would've used “addi” for “addict”. You have https://funbookmarking.com/story19011528/new-step-by-step-map-for-bip39-english-words