Bip39 api https://edgargvkh682.theburnward.com/a-novice-s-overview-to-getting-a-bip39-mnemonic-expression While it takes advantage of BIP32 process you can however import BIP39 seeds into Electrum wallet. Also besides BIp32 You can find BIP44 version which some wallet use for the era of seeds. For words that only have 3 letters, there is not any 4th letter. Such https://bookmarksknot.com/story22451926/bip39-wordlist-english-github-detailed-notes-on-bip39-wallet-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw