For words that only have 3 letters, there's no 4th letter. For instance with the word “increase”, there won't be any a lot more letters Later on and therefore need to be the word "incorporate". The word “addict” is during the BIP39 wordlist however you would've made use of “addi” https://thebookmarkking.com/story18813024/the-invalid-bip39-phrase-diaries