An 18-word mnemonic phrase increases protection by introducing added words for the sequence. Below’s an instance: Standard recovery phrases use a specific list of 2048 words adhering to the BIP39 standard (Bitcoin Advancement Proposal 39). You can verify When your words are Element of the BIP39 list applying these resources: https://postheaven.net/tiablexcen/mastering-your-copyright-protection-the-essential-overview-to-bip39-passphrases