Bip39 Dictionary. The passphrase is not selected in the predefined list of 2048 words – it can be any word or phrase you choose. BIP39 is really a design implementation that lays out how copyright wallets make the set of words (or "mnemonic codes") which make up a mnemonic sentence, https://socialbaskets.com/story4197704/bip39-generator-https-linktr-ee-bip39-not-known-details-about-bip39-wallets