The order of the wordlist for Electrum doesn't actually matter.
Why doesn't it matter ?
The secret information (11 bit number; decimal: 0-2047) is used as an index to pick the correct word.
While the standard wordlist is sorted alphabetically, this doesn't have to be the case with your own wordlist. And in this case the order does indeed matter.
In fact, you don't need to have the word list at all. If I use a custom wordlist to generate a seed on Electrum, I can restore that wallet from the same seed phrase on any copy of Electrum, with or without the custom worsdlist.
How would electrum be able to derive the 11 bit number from a random word without having its position in a given list ?
The security could also very well be worse than the standard wordlist depending on how I pick my wordlist. If my wordlist is made up of 10 names of my immediate family members, then it will be very insecure.
I was assuming that OP is talking about a custom wordlist with 2048 entries.
Anything else (e.g. using only 2 words alternating for the whole wordlist) obviously is absolutely dumb (and wouldn't work).
If you pick 2048 names of your friends, familiy, pets, etc.. the security isn't affected.
