Bip39 Npm. The passphrase is not chosen in the predefined list of 2048 words – it could be any word or phrase you choose. BIP39 is actually a layout implementation that lays out how copyright wallets develop the set of words (or "mnemonic codes") which make up a mnemonic sentence, https://socialinplace.com/story4592775/bip39-word-list-pdf-https-linktr-ee-bip39-5-easy-facts-about-bip39-generator-described