An eighteen-word mnemonic phrase improves security by adding extra words to the sequence. Listed here’s an instance: Standard recovery phrases use a selected list of 2048 words pursuing the BIP39 standard (Bitcoin Improvement Proposal 39). You can confirm When your words are Element of the BIP39 list applying these methods: https://socialtechnet.com/story4456555/the-2-minute-rule-for-bip39-all-words