Bip39 Words. The passphrase is just not selected with the predefined list of 2048 words – it might be any word or phrase you choose. BIP39 is actually a structure implementation that lays out how copyright wallets make the set of words (or "mnemonic codes") that make up a mnemonic https://nanobookmarking.com/story18606724/bip39-word-list-pdf-https-linktr-ee-bip39-about-ian-coleman-bip39