An eighteen-word mnemonic phrase increases stability by including additional words into the sequence. Below’s an example: Standard recovery phrases use a specific list of 2048 words adhering to the BIP39 standard (Bitcoin Improvement Proposal 39). You can validate if your words are Component of the BIP39 list applying these means: https://thebookpage.com/story4206099/top-latest-five-bip39-seed-phrase-mnemonics-generator-urban-news