For words that only have three letters, there is not any 4th letter. For example with the word “increase”, there isn't any far more letters Later on and therefore have to be the word "incorporate". The word “addict” is inside the BIP39 wordlist but you would've made use of “addi” https://bookmarkpagerank.com/story18999824/an-unbiased-view-of-bip39-seed-phrase-github