Bip39 List. The passphrase just isn't selected in the predefined list of 2048 words – it may be any word or phrase you select. BIP39 is actually a design implementation that lays out how copyright wallets make the set of words (or "mnemonic codes") which make up a mnemonic sentence, https://royalbookmarking.com/story18630330/bip39-passphrase-https-linktr-ee-bip39-the-bip39-wallet-diaries