So it surprised me when Electrum generated some seed words that had more than one possibilities when writing down word (the words were GROUp - GROUnd and COMMit - COMMon.
In that case, when restoring to Electrum, pay attention to the suggested word's highlight:
- If it's highlighted in yellow like this: common, it belongs to Electrum's old wordlist which isn't used to generate new Electrum seed phrase or in BIP39.
- If there's none, it belongs to BIP39 wordlist.