Bip39 hd wallet https://zanevnex175.lowescouponn.com/practical-use-a-python-based-bip39-seed-generator-in-the-real-world Even though it makes use of BIP32 technique it is possible to still import BIP39 seeds into Electrum wallet. Also other than BIp32 You can find BIP44 Variation which some wallet use for the generation of seeds. For words that only have three letters, there is https://socialwoot.com/story22648434/bip39gen-indicators-on-bip39-ian-coleman-you-should-know-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw