For words that have only three letters, there is not any 4th letter. Such as with the word “incorporate”, there won't be any more letters Later on and therefore have to be the word "add". The word “addict” is from the BIP39 wordlist but you might have utilized “addi” for https://other-space.uncrn.co/blog/bip39-word-list-explained-your-necessary-resource-for-creating-secure-wallets-in-the-copyright-room/