my parents are from the east coast and I grew up hearing "supper's ready!". I was raised in the midwest and invited to friends houses "for dinner". As I've moved further west in my life, I hear "supper" less and less, even though I use the words interchangeably.

Which do you use? Is it a regional thing? Can i use them interchangably, or do they actually mean different things?

btw, i also say "soda" instead of "pop".