Bip39 word list trust wallet https://atavi.com/share/xbwf7vz16jgof While it utilizes BIP32 system you may still import BIP39 seeds into Electrum wallet. Also apart from BIp32 there is BIP44 Edition which some wallet use for that era of seeds. For words that only have 3 letters, there is absolutely no 4th letter. https://bookmarklayer.com/story20072055/bip39-seed-words-indicators-on-bip39-ian-coleman-you-should-know-https-t-me-bip39-chat