For words that have only three letters, there is no 4th letter. For instance with the word “increase”, there are no extra letters Later on and thus should be the word "incorporate". The word “addict” is from the BIP39 wordlist however you might have used “addi” for “addict”. bip39-phrase.com is https://socialwebleads.com/story5074317/facts-about-bip39-seed-phrase-word-list-revealed