For words that have only three letters, there isn't any 4th letter. For instance with the word “incorporate”, there aren't any far more letters afterwards and therefore have to be the word "increase". The word “addict” is inside the BIP39 wordlist however , you would have made use of “addi” https://7prbookmarks.com/story18825376/an-unbiased-view-of-bip39-seed-phrase-github