is there a book of terms that I could obtain to translate to the counter guys?
Catalogs are freely available most everywhere. Even Home Depot has a catalog.
I have to say I'm not too keen on the fact that you're so comfortable stepping out of the bounds of what you should be doing. That may be carrying over to the guys in the supply house too. In most areas I know of a license (and Insurance) is required to do Electrical work for pay. I think I'd count myself lucky that no one has turned me in or filed complaints/charges yet.
Bill