http://en.wikipedia.org/wiki/Scone_(bread) I've noticed this in Australia where chips refer to fish and chip shop chips as well as crisps. So instead of being able to say "Do we want some crisps with our chips?" they have to say "Do we want some chips with our hot chips?" Just seems a bit pointless. What if you like cold chips? "I like cold, hot chips"
How do you tell the difference? A Tim Tam is covered in chocolate and has frosting in the middle but it's still a biscuit. I think it depends on who you ask. Pure chocolate is usually called chocolate but if it's in a bar form it's usually called a candy bar or chocolate bar. Also if it's a truffle or something small covered in chocolate it's usually called candy or chocolates. Oh and then we have bridge mix which is excellent.