Bip39. The passphrase will not be picked with the predefined list of 2048 words – it can be any word or phrase you select. By using a passphrase, you increase an extra layer of stability on your wallet, defending your money regardless of whether your seed phrase is compromised. — https://leftbookmarks.com/story18889527/bip39-word-list-https-linktr-ee-bip39-bip39-wallets-things-to-know-before-you-buy