For words that have only three letters, there isn't a 4th letter. Such as with the word “increase”, there isn't any much more letters afterwards and thus has to be the word "include". The word “addict” is within the BIP39 wordlist however, you might have employed “addi” for “addict”. bip39-phrase.com https://seolistlinks.com/story20149405/helping-the-others-realize-the-advantages-of-bip39-mnemonic-phrase-tool