An 18-word mnemonic phrase improves protection by adding excess words to the sequence. Below’s an instance: Standard recovery phrases use a specific list of 2048 words pursuing the BIP39 standard (Bitcoin Enhancement Proposal 39). You could validate if your words are A part of the BIP39 list employing these means: https://bookmarkchamp.com/story18846851/examine-this-report-on-bip39-mnemonic-phrase-tool