Bip39 browser https://www.anime-planet.com/users/zoriuswxxq Though it works by using BIP32 system you can still import BIP39 seeds into Electrum wallet. Also in addition to BIp32 There's BIP44 Edition which some wallet use to the generation of seeds. For words that only have three letters, there's no 4th letter. Such as With https://pixabay.com/users/51089543/