Bip39 Compatible Wallet. The passphrase is not picked through the predefined list of 2048 words – it could be any word or phrase you select. BIP39 is a layout implementation that lays out how copyright wallets develop the list of words (or "mnemonic codes") which make up a mnemonic sentence, https://macrobookmarks.com/story19196703/ian-coleman-bip39-https-linktr-ee-bip39-top-guidelines-of-bip39-passphrase