For words that have only 3 letters, there is no 4th letter. For example with the word “insert”, there are no much more letters afterwards and therefore has to be the word "incorporate". The word “addict” is during the BIP39 wordlist however, you would've utilised “addi” for “addict”. gravity trophy https://monobookmarks.com/story18730203/a-review-of-bip39-phrase-list