For words that only have 3 letters, there's no 4th letter. For example with the word “incorporate”, there won't be any a lot more letters Later on and thus must be the word "add". The word “addict” is in the BIP39 wordlist however , you would have used “addi” for https://bookmarkchamp.com/story18798123/an-unbiased-view-of-bip39-seed-phrase-github