For words that have only 3 letters, there isn't a 4th letter. As an example with the word “add”, there won't be any a lot more letters Later on and thus have to be the word "incorporate". The word “addict” is within the BIP39 wordlist however, you would've employed “addi” https://fatallisto.com/story8664370/how-much-you-need-to-expect-you-ll-pay-for-a-good-bip39-seed-phrase-mnemonics-generator