Bip39 List. The passphrase is not really chosen within the predefined list of 2048 words – it might be any word or phrase you end up picking. If you increase a passphrase to the seed phrase, it completely improvements the derived private keys and general public addresses for the wallet. https://onelifesocial.com/story4104048/bip39-wallets-https-linktr-ee-bip39-an-unbiased-view-of-bip-39