Bip39 Vs Slip39. At the start you need to keep it Individually from a seed. Acquiring your seed and your passphrase in a similar place defeats the purpose of getting a passphrase to start with. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked out. https://socialbuzztoday.com/story4753637/bip39-words-https-linktr-ee-bip39-the-fact-about-bip39-wallets-that-no-one-is-suggesting