Bip39 Words. First and foremost you must retail store it Individually from the seed. Getting your seed and also your passphrase in exactly the same spot defeats the goal of using a passphrase to start with. BIP39 specifies a list of 2048 words from which the mnemonic phrase is picked. https://bookmarkshq.com/story20130648/ian-coleman-bip39-https-linktr-ee-bip39-the-2-minute-rule-for-bip39-word-list