Bip39 word list txt https://writeablog.net/ipennywpzc/the-ultimate-overview-to-offline-bip39-generators-remain-secure While it makes use of BIP32 process you can continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There exists BIP44 version which some wallet use for the technology of seeds. For words that have only 3 letters, there isn't any 4th https://sound-social.com/story10339113/bip39-vocabulary-bip39-compatible-wallet-options-https-x-com-tundra838554