Bip39-Standalone. The passphrase is just not selected from your predefined list of 2048 words – it could be any word or phrase you select. BIP39 can be a design implementation that lays out how copyright wallets generate the list of words (or "mnemonic codes") that make up a mnemonic sentence, https://classifylist.com/story20435116/bip39-words-https-linktr-ee-bip39-what-does-ian-coleman-bip39-mean