Bip39 word generator https://padlet.com/alexzhiglatyzbugt/bookmarks-68ta5bpd7yy3slro/wish/PVKBQO1nwDeMWj5x Despite the fact that it utilizes BIP32 method you could however import BIP39 seeds into Electrum wallet. Also other than BIp32 There exists BIP44 Edition which some wallet use to the technology of seeds. For words that have only three letters, there isn't any 4th letter. https://linkingbookmark.com/story20486336/bip39-entropy-to-mnemonic-not-known-details-about-bip39-word-list-txt-https-x-com-tundra838554