I generated new wallet yesterday on Electrum and noticed something funny. The other day I saw
article which states that every BIP39 word can be shortened to just four letters when writing down seed phrase.
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.
I don't know about a secret of first 4 letters but I knew that in Electrum wallet, when you type words for its wallet seed, you will be recommended a list of possible words. This feature is available for both Electrum wallet software on desktop and mobile devices.
Additionally, you can always find words in BIP word lists for example word list for BIP39.
https://github.com/bitcoin/bips/blob/master/bip-0039/english.txtI don't think complicate your wallet backup methods is good idea.
If you want to back up your wallet safely, read
How to back up a seed phrase?