Seed Phrase Words List. Regardless that it uses BIP32 system you could still import BIP39 seeds into Electrum wallet. Also apart from BIp32 There exists BIP44 version which some wallet use to the era of seeds. The tool will propose quite a few options for the missing word as well https://dominickbnxis.salesmanwiki.com/9235758/the_anatomy_of_the_bip39_phrase_entropy_text_and_stability