My daughter developed and is doing well so far. HOWEVER, is this incidence a reason for concern!?

My daugher is 5 years old and gets confused about what meals are called. She calls breakfast the first meal because she cant seem to get that breakfast and lunch are different. Some kids dont know what you mean when you say Dinner. She is fine I am sure. Also maybe she might have thought that was a snack. Sometimes kids just get confused is all.