For words that only have 3 letters, there isn't any 4th letter. Such as with the word “increase”, there aren't any additional letters Later on and thus has to be the word "incorporate". The word “addict” is inside the BIP39 wordlist however, you might have utilized “addi” for “addict”. A https://moodjhomedia.com/story2582441/how-much-you-need-to-expect-you-ll-pay-for-a-good-valid-bip39-seed-phrase