Basically what you are saying, is that it's hard for you to remember these words. Part of the fun of Scrabble is in expanding your vocabulary. Accept the challenge instead of limiting yourself. There's already a clear, concise Scrabble word list. Use it.
By the way, ETC* is not acceptable, because it's not a word--it's an abbreviation without its own pronunciation. Amp, ref, and ex are all commonly used English words, so I'm not sure why they offend you. How often do you really say "amperage" or "ampere" rather than amp?
Just to make it clear.
Main Entry: 2viola
Pronunciation: vE-'O-l&
Function: noun
Etymology: Italian & Spanish, viol, viola, from Old Provençal, viol
Date: circa 1724
: a musical instrument of the violin family that is intermediate in size and compass between the violin and cello and is tuned a fifth below the violin
- violist
The one day you'd sell your soul for something, souls are a glut.