Oh, good, Trouser ... you put a thought in my head where it is now like a tune I can't keep from running like a tape loop!
Welcome to our merry band.
Now, I use thaw when something takes a long time - like the frozen Butterball turkey at Thanksgiving - where it takes 24-38 hours in the fridge.
Defrost I tend to use when it takes just a short time like hamburger patties left in the fridge for a few hours or "nuked" if you're in a hurry - although I don't like to do that. I think it changes the flavor but that could just be me.