For words that only have 3 letters, there is no 4th letter. Such as with the word “incorporate”, there won't be any much more letters afterwards and thus needs to be the word "increase". The word “addict” is during the BIP39 wordlist but you might have utilized “addi” for “addict”. https://bookmarkmiracle.com/story20321259/considerations-to-know-about-bip39-seed-phrase-generator