For words that only have three letters, there is no 4th letter. For example with the word “increase”, there isn't any far more letters Later on and so should be the word "add". The word “addict” is during the BIP39 wordlist however you would've utilised “addi” for “addict”. This additional https://socialwebconsult.com/story4895835/considerations-to-know-about-bip39-seed-phrase-generator