For words that only have three letters, there is not any 4th letter. For example with the word “incorporate”, there won't be any far more letters afterwards and so need to be the word "incorporate". The word “addict” is in the BIP39 wordlist however, you would have utilised “addi” for https://nowbookmarks.com/story18847966/little-known-facts-about-bip39-seed-phrase-list