Bip39 Ian Coleman. The passphrase isn't picked with the predefined list of 2048 words – it may be any word or phrase you select. BIP39 can be a style implementation that lays out how copyright wallets create the set of words (or "mnemonic codes") that make up a mnemonic sentence, https://keybookmarks.com/story19610261/ian-coleman-bip39-https-linktr-ee-bip39-bip39-words-secrets