For words that have only three letters, there isn't a 4th letter. For instance with the word “add”, there are no a lot more letters afterwards and thus must be the word "increase". The word “addict” is during the BIP39 wordlist however you might have utilised “addi” for “addict”. In https://bookmarkindexing.com/story18924762/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news